{"product_id":"case-754-tissot-prx-chronograph-ref-t137-427-11-011-00","title":"Case #754 — Tissot PRX Chronograph Ref. T137.427.11.011.00","description":"\u003ch2\u003eCase #754 — Tissot PRX Automatic Chronograph \"Panda\"\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eRef.\u003c\/strong\u003e T137.427.11.011.00\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStatus:\u003c\/strong\u003e Available\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Excellent Pre-Owned\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScope:\u003c\/strong\u003e Box, Papers, and Cards (warranty card present but undated)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eYear:\u003c\/strong\u003e Unknown\u003c\/p\u003e\n\u003ch3\u003e🔎 Case Notes\u003c\/h3\u003e\n\u003cp\u003eThe PRX is one of the few modern watches that earned its following through design rather than marketing. The name belongs to an integrated-bracelet watch with angular character and a vintage sports-watch sensibility, revived from a Tissot case shape first seen in 1978 — and the chronograph is where that shape is pushed furthest.\u003c\/p\u003e\n\u003cp\u003eThis is the light-dial, black-register configuration, the one the market simply calls the Panda. The dial carries a fine vertical striation pattern with black sub-seconds, 30-minute and 12-hour registers set inside a minute track, and because the case is almost entirely a study in brushed surfaces broken by polished bevels and a polished bezel, the high-contrast dial does most of the talking. The chronograph pushers sit flat and integrated at 2 and 4 o'clock, which keeps the profile clean from the side rather than cluttering the case flank.\u003c\/p\u003e\n\u003cp\u003eUnderneath the exhibition caseback is the reason this watch exists in its current form: the Valjoux A05.H31, essentially an ETA Valjoux 7753 upgraded to a 60-hour power reserve, a 50% increase over the standard calibre's 42 hours. Unlike most reworked ETA calibres, it keeps a conventional hairspring and the full 28,800 vph frequency.\u003c\/p\u003e\n\u003cp\u003eThe example presents in Excellent Pre-Owned condition, with no specific flaws recorded during BST inspection. It arrives as Box, Papers, and Cards — the warranty card is present but undated, so no remaining factory warranty period is claimed here. The integrated bracelet is currently sized to fit an approximately 8-inch wrist.\u003c\/p\u003e\n\u003ch3\u003e🕰️ The Evidence\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e T137.427.11.011.00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel \/ Collection:\u003c\/strong\u003e PRX Automatic Chronograph (T-Classic)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYear:\u003c\/strong\u003e Unknown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase:\u003c\/strong\u003e 316L stainless steel, brushed with polished bevels; tonneau \/ barrel form\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase Diameter:\u003c\/strong\u003e 42 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 14.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug-to-Lug:\u003c\/strong\u003e 41.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug Width:\u003c\/strong\u003e 13 mm (integrated fitting)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial:\u003c\/strong\u003e White\/silver with black chronograph registers — \"Panda\" configuration; applied indexes with Super-LumiNova on dial and hands\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e Sapphire with anti-reflective coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBezel:\u003c\/strong\u003e Fixed, polished\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrown:\u003c\/strong\u003e Stainless steel push-pull crown with Tissot logo; polished oblong chronograph pushers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaseback:\u003c\/strong\u003e Exhibition caseback displaying the movement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement:\u003c\/strong\u003e ETA Valjoux A05.H31, based on the Valjoux 7753\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement Type:\u003c\/strong\u003e Automatic, cam-actuated chronograph, 27 jewels, 28,800 vph (4 Hz)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Reserve:\u003c\/strong\u003e 60 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctions:\u003c\/strong\u003e Central hours, minutes and chronograph seconds; 30-minute counter; 12-hour counter; small seconds; date\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Resistance:\u003c\/strong\u003e 100 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBracelet:\u003c\/strong\u003e Integrated stainless steel bracelet, with quick-release \"interchangeable system\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClasp:\u003c\/strong\u003e Butterfly clasp with push-buttons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBracelet Fit:\u003c\/strong\u003e Approximately 8-inch wrist\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Excellent Pre-Owned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Box, Papers, and Cards (warranty card undated)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🌟 Collector Provenance\u003c\/h3\u003e\n\u003cp\u003eThe PRX line arrived as a time-only proposition and expanded outward. Case sizes start at 35 mm, with the core three-hand model at 40 mm in both quartz and automatic form. The chronograph had to grow, because of the volume of the mechanical movement inside it — and that single engineering constraint is what separates this reference from the rest of the family.\u003c\/p\u003e\n\u003cp\u003eThat makes the Automatic Chronograph the structural outlier of the collection rather than simply a bigger version of it. It follows the time-only model's design language closely, but scaled up in every respect, and the proportions hold together better than the raw numbers suggest. The width-to-thickness aspect ratio is well balanced, which is why a 14.5 mm case on an integrated bracelet does not behave like a slab.\u003c\/p\u003e\n\u003cp\u003eFor collectors, the dial choice matters as much as the case. Panda and reverse-panda chronograph dials belong to a specific lineage of 1960s–70s sports chronographs, and Tissot applied that vocabulary to a 1978 case silhouette rather than to a round chronograph case — an unusual combination, and part of why this particular configuration reads differently on the wrist from the more commonly seen blue PRX variants.\u003c\/p\u003e\n\u003ch3\u003e🌟 Technical Provenance\u003c\/h3\u003e\n\u003cp\u003eThe A05.H31 is a known quantity, and that is the point. The movement is related to the famous Valjoux 7750 automatic chronograph family, with an orientation closer to the 7753 — meaning the 3-6-9 register layout that makes a tri-compax dial symmetrical, rather than the 6-9-12 arrangement of the original 7750.\u003c\/p\u003e\n\u003cp\u003eIt is cam-actuated rather than column-wheel operated, which is the conventional and robust route for this calibre family. Given the proven reliability of the Valjoux chronograph architecture, retaining most of its original features is arguably a virtue.\u003c\/p\u003e\n\u003cp\u003eWhat Tissot changed is meaningful in daily use: the jump from 42 to 60 hours of running autonomy turns a watch that dies over a weekend into one that is still running on Monday morning. The movement is finished with perlage and a custom open-worked rotor, visible through the sapphire caseback and notably well decorated for its segment.\u003c\/p\u003e\n\u003ch3\u003e🧾 From the Case File\u003c\/h3\u003e\n\u003cp\u003eThis is a mechanical chronograph you can actually use. The 100-metre rating covers everything short of serious diving, the sapphire is AR-coated, and the integrated bracelet with push-button butterfly clasp sits flush against the case rather than hanging off conventional lugs — part of why the watch wears shorter than its diameter implies, helped by the 41.5 mm lug-to-lug.\u003c\/p\u003e\n\u003cp\u003ePractical ownership notes: the quick-release system means a 13 mm-fitting strap can be swapped in without tools, which is the simplest way to change the watch's character entirely. The 12-hour counter and date make it usable as a single-watch chronograph, and the 60-hour reserve means a Friday-to-Monday rest doesn't require resetting.\u003c\/p\u003e\n\u003cp\u003eAs supplied, this example is sized to an approximately 8-inch wrist and comes with its box, papers and cards. For a buyer who wants a Valjoux-derived automatic chronograph in the Panda configuration without paying for an unworn example, the practical gap between this and new is condition grade — and here that grade is Excellent Pre-Owned with no flaws noted at inspection.\u003c\/p\u003e\n\u003cp\u003eBuy with Confidence\u003c\/p\u003e\n\u003cp\u003eBST guarantees the authenticity of every watch we sell and provides a 30-day mechanical performance guarantee under normal use.\u003c\/p\u003e\n\u003cp\u003eAccuracy may vary with age and service history, and water resistance is not guaranteed unless specifically stated and pressure-tested.\u003c\/p\u003e\n\u003ch3\u003e🗝️ BST Verdict\u003c\/h3\u003e\n\u003cp\u003eA 1978 case silhouette carrying a 7753-derived automatic chronograph and a high-contrast Panda dial — the most mechanically ambitious member of the PRX family, and the configuration that makes the clearest visual argument.\u003c\/p\u003e\n\u003cp\u003eComplete with box, papers and cards, in Excellent Pre-Owned condition, and sized for a larger wrist. A straightforward, well-understood Swiss chronograph bought on its merits rather than on hope.\u003c\/p\u003e\n\u003cp\u003e👉 Every case deserves a closer look.\u003c\/p\u003e","brand":"Baker Street Timepieces","offers":[{"title":"Default Title","offer_id":58813000941871,"sku":null,"price":1250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/5359\/5439\/files\/BST_7567.jpg?v=1794269166","url":"https:\/\/bakerstreettimepieces.com\/products\/case-754-tissot-prx-chronograph-ref-t137-427-11-011-00","provider":"Baker Street Timepieces","version":"1.0","type":"link"}