Case #492 — Tudor Black Bay "One" 36 Ref. M79640

Case #492 — Tudor Black Bay "One" 36 Ref. M79640

Status: Active Investigation
Condition: Excellent Pre-Owned
Scope: Box, Papers, and Cards
Year: 2025

🔎 Case Notes

The Tudor Black Bay 36 Ref. M79640 is one of the most versatile watches in Tudor’s modern lineup — a reference that takes the broader Black Bay design language and distills it into a cleaner, more compact everyday format. At 36mm, it wears with an easy balance that feels refined, sporty, and highly practical on the wrist.

What makes this reference especially appealing is its simplicity. Without a rotating dive bezel or heavier tool-watch styling, the Black Bay 36 leans more directly into the daily-wear side of Tudor’s catalog. It still carries the familiar Black Bay character through the case shape, dial layout, and strong overall build quality, but the smaller format makes it especially adaptable.

This example dates to 2025 and is presented in excellent pre-owned condition. Overall, it shows only light wear consistent with careful use. It includes box, papers, and cards and is currently sized to fit approximately a 7.25–7.5 inch wrist.

🕰️ The Evidence

Reference: M79640
Model: Tudor Black Bay 36
Case: Stainless Steel
Case Size: 36 mm
Bezel: Smooth Steel Bezel
Crystal: Sapphire
Dial: Grey 
Movement: Automatic
Bracelet: Stainless Steel Bracelet
Bracelet Fit: Approximately 7.25–7.5" wrist
Water Resistance: 100 m
Year: 2025
Accessories: Box, Papers, and Cards

Condition Notes: Excellent pre-owned condition overall, with light wear consistent with careful use.

⌚ Black Bay Heritage

The Black Bay line is most often associated with Tudor’s dive-watch heritage, but the 36mm version shows how well that design language works in a more streamlined format. By stripping the watch back to the essentials, Tudor created a piece that still feels sporty and substantial, but with a more refined and universally wearable personality.

That matters because the Black Bay 36 occupies a very useful space. It feels less like a dedicated dive watch and more like a true everyday sports watch — simple, capable, and easy to wear across a wide range of settings.

🌟 Collector Provenance

The appeal here is rooted in versatility, size, and ease of wear. The 36mm case gives the watch broad wrist appeal, while the all-steel format keeps the overall look clean and highly adaptable. It is a reference that makes a lot of sense for someone who wants Tudor quality and identity in a format that feels more compact and understated than the larger Black Bay models.

Examples that include box, papers, and cards remain especially attractive, and a 2025 example in excellent pre-owned condition sits in a strong lane for a buyer looking for a modern Tudor with broad everyday flexibility.

🧾 From the Case File

Recovered as a 2025 Tudor Black Bay 36 Ref. M79640. Box, papers, and cards. Excellent pre-owned condition overall. Sized to approximately a 7.25–7.5 inch wrist.

🗝️ BST Verdict

Case #492 delivers a clean, compact Tudor sports watch with the kind of broad everyday wearability that makes the Black Bay 36 so appealing. With its 36mm case, full-set presentation, and excellent overall condition, this is a very attractive example of the Black Bay 36.

👉 Every case deserves a closer look.