Case #653 — Omega Speedmaster Professional Moonwatch (Hesalite) Ref. 3570.50

Case #653 — Omega Speedmaster Professional Moonwatch "Hesalite"

Ref. 3570.50

Status: Available

Condition: Good Pre-Owned

Scope: Watch Only

Year: Unknown

🔎 Case Notes

Some watches require an introduction. This one requires only a reference number. The 3570.50 was one of the longest-running references in the Speedmaster line, produced from 1996 until 2014, when it gave way to the 311.30.42.30.01.005 — nearly two decades of a design that Omega saw no reason to modernise, because NASA had already qualified it and the Moon had already tested it.

This is the traditional configuration: stainless steel case and bracelet, hesalite crystal, solid steel caseback, black dial with stick indices, and the stepped tachymeter bezel. No sapphire, no display back, no concessions. The hesalite is the point rather than the compromise — a domed acrylic front that warps light across the dial in a way sapphire never has, and the specification NASA preferred for reasons of shatter behaviour in a pressurised cabin.

Condition is honest and stated plainly. The watch presents in very nice shape for its age, with some minor wear visible throughout the case and across the hesalite crystal. The bracelet is very clean, showing only minor visible wear. Hesalite is a forgiving material — light marks are part of its character, and it is a component Omega service centres routinely replace should a future owner prefer a fresh crystal.

On the bench, the movement recorded a timekeeping rate of −5 seconds per day at an amplitude of 342°. Winding action is normal and the chronograph operates normally. The year of this individual example is not documented, and we will not estimate one from the reference's production window.

The bracelet is currently sized to fit an approximately 7-inch wrist. This example is offered as Watch Only — no box, papers or cards accompany it.

🕰️ The Evidence

• Reference: 3570.50
• Model / Collection: Speedmaster Professional Moonwatch
• Year: Unknown
• Case: Stainless Steel
• Case Diameter: 42 mm
• Lug Width: 20 mm
• Dial: Black with luminous stick indices; small seconds, 30-minute recorder and 12-hour recorder
• Crystal: Hesalite (acrylic)
• Bezel: Fixed stainless steel bezel with black tachymeter scale
• Caseback: Solid stainless steel, stamped with the seahorse motif and the NASA flight-qualification and Moon engravings associated with the reference
• Movement: Omega Calibre 1861
• Movement Type: Manual winding, cam-operated chronograph
• Power Reserve: 48 hours
• Functions: Hours, minutes, small seconds, chronograph (central seconds, 30-minute and 12-hour registers), tachymeter scale
• Water Resistance: 50 metres / 5 bar
• Bracelet: Omega stainless steel Speedmaster bracelet
• Clasp: Steel folding / deployant clasp
• Bracelet Fit: Approximately 7-inch wrist
• Measured Performance: −5 seconds per day; amplitude 342°
• Condition: Good Pre-Owned — minor wear visible throughout the case and hesalite crystal; bracelet very clean with minor visible wear
• Included: Watch Only

🌟 Collector Provenance

Within Speedmaster collecting, the 3570.50 occupies a specific and well-understood position: it is the last long-running "pure" Moonwatch of the pre-2014 era, and the reference most enthusiasts mean when they say they own a Speedy Pro. It sits directly between the vintage 145.022 lineage and the current-generation Moonwatch, sharing the former's proportions and the latter's availability.

Its closest siblings clarify what it is. The 3572.50.00 paired a hesalite front with a sapphire caseback and calibre 1863, while the 3573.50.00, introduced in 2002, used sapphire front and back with the same 1863. The 3570.50 kept the closed caseback and the plexi front, powered by calibre 1861 — the configuration that mirrors the flight-qualified specification rather than the dress-case interpretation of it.

The movement itself is the reference's quiet argument. The 1861 is a modern iteration of the 861, with 18 jewels and rhodium plating, and Omega describes it as the famous manual-winding movement that was worn on the Moon. It is cam-operated rather than column-wheel, which is precisely why it has remained serviceable, robust and comparatively inexpensive to maintain across decades of daily use.

Hesalite examples also carry a practical collecting advantage: the crystal is a wear item by design. A scuffed hesalite is not a devalued watch in the way a scratched sapphire bezel insert would be — it is a consumable that any competent watchmaker can polish or replace, which is one reason long-term owners gravitate toward this variant.

🌟 Historical Provenance

The Speedmaster arrived in 1957 as a sports and racing chronograph, notable at launch for placing the tachymeter scale on the bezel rather than the dial — a legibility decision made for drivers that inadvertently created one of the most recognisable watch silhouettes of the twentieth century.

Its trajectory changed with NASA. The watch was used by the Gemini Titan III crews and subsequently by the Apollo 11 astronauts, making it the first watch worn on the Moon. Armstrong and Aldrin wore the 105.012; Michael Collins wore the 145.012.

When Omega introduced the 3570.50.00 in 1996, it was positioned as a close descendant of those Apollo 11-era models, retaining the shatterproof hesalite crystal, the black dial with white accents, and the three-register layout. The principal departures from the flight-era watches were the shift away from tritium luminescence and the updated calibre. That is the honest description of what this watch is: not a replica and not a reissue, but the same design line continued without interruption.

🧾 From the Case File

At 42 mm with 20 mm lugs, the Moonwatch wears smaller than its diameter suggests — the lugs are short, the bezel is broad, and the dial opening is modest. On a 7-inch wrist, which is where this bracelet is currently sized, it sits flat and centred without overhang.

Manual winding is the defining daily ritual here. The calibre 1861 offers a 48-hour power reserve and the watch is water resistant to 50 metres — enough for rain, handwashing and ordinary life, but this is not a swimming watch and should not be treated as one. The trade-off is a case that stays slim and a chronograph you actually engage with rather than ignore.

Practically, this example makes a strong case as a wearing watch rather than a safe-queen. It is graded Good Pre-Owned, with wear disclosed on the case and crystal, which means the first scratch has long since happened and the next one will not keep anyone awake. The bracelet, notably, is very clean — often the first component to look tired on a well-used Speedmaster, and the more expensive one to replace.

The measured figures are supplied for transparency, not as a warranty: −5 seconds per day with 342° amplitude, with normal winding and normal chronograph operation at the time of inspection. No service history has been supplied with this watch, and we make no claim of one. A buyer should budget for eventual servicing as with any manual chronograph of unknown maintenance history.

🗝️ BST Verdict

The most recognisable chronograph in watchmaking, in the configuration that earned the reputation: hesalite front, solid caseback, calibre 1861, steel bracelet. Honestly worn, honestly graded, and offered without box or papers — which is precisely how a great many of the best-wearing Speedmasters reach their next owner.

If the appeal of a Moonwatch is using it, this is a sensible entry point into the reference that defined the modern Speedmaster for eighteen years.

👉 Every case deserves a closer look.