Case #448 — Tudor Black Bay GMT “Pepsi” Black on Oyster Ref. M79830RB

Case #448 — Tudor Black Bay GMT “Pepsi” Black on Oyster Ref. M79830RB

Status: Active Investigation
Condition: Excellent Pre-Owned
Scope: Box, Papers, and Cards
Year: 2020

🔎 Case Notes

The Tudor Black Bay GMT “Pepsi” Ref. M79830RB is one of the strongest modern travel watches in Tudor’s lineup — a watch that takes the core Black Bay design language and gives it true GMT functionality with the classic burgundy-and-blue bezel that earned it the “Pepsi” nickname. At 41mm, it has enough presence to feel like a proper sport watch, but the proportions remain balanced enough for daily wear. The reference is built around a 41mm steel case, domed dial, sapphire crystal, in-house GMT movement, and 200m water resistance.

What makes this reference especially appealing is its balance of utility and familiarity. The bidirectional 24-hour bezel and jumping local hour hand make it genuinely useful for travel, while the black dial keeps the overall look grounded and versatile. On Oyster bracelet, it feels especially direct and wearable — a strong everyday configuration for one of Tudor’s best-known modern GMT references.

This example dates to 2020 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 7.75-inch wrist.

🕰️ The Evidence

Reference: M79830RB
Model: Tudor Black Bay GMT “Pepsi” Black
Case: Stainless Steel
Case Size: 41 mm
Bezel: Bidirectional 24-hour burgundy and blue bezel
Crystal: Sapphire
Dial: Black
Movement: Automatic GMT
Bracelet: Stainless Steel Oyster Bracelet
Bracelet Fit: Approximately 7.75" wrist
Water Resistance: 200 m
Year: 2020
Accessories: Box, Papers, and Cards

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

🌍 GMT Heritage

The Black Bay GMT brings Tudor’s vintage-inspired sports-watch design language into the travel-watch category, combining familiar Black Bay cues with a true GMT layout. The result is a watch that still feels unmistakably like a Black Bay, but with the added practicality of tracking multiple time zones. Tudor’s GMT platform remains one of the brand’s most useful modern sport-watch formats.

That matters because this watch does not feel like a compromise between categories. It still has the visual strength of a dive-inspired sports watch, but with the functionality of a true GMT. The black-dial “Pepsi” version remains the classic modern expression of that formula.

🌟 Collector Provenance

The appeal here is rooted in recognizability, utility, and broad collector appeal. The Black Bay GMT has built a strong following because it offers what many buyers want in a modern GMT: in-house movement, practical travel function, strong bracelet presence, and a look that feels both familiar and distinctive. The black-dial version remains the most traditional and widely recognizable path in the line.

Examples that include box, papers, and cards remain especially attractive, and a 2020 example in excellent pre-owned condition sits in a very strong lane for someone looking for a modern Tudor GMT with broad everyday wearability.

🧾 From the Case File

Recovered as a 2020 Tudor Black Bay GMT “Pepsi” Black Ref. M79830RB. Box, papers, and cards. Excellent pre-owned condition overall. Sized to approximately a 7.75-inch wrist.

🗝️ BST Verdict

Case #448 delivers one of Tudor’s most compelling modern sport-watch references in its most classic GMT configuration. With its black dial, “Pepsi” bezel, full-set presentation, and excellent overall condition, this is a very attractive example of the Black Bay GMT.

👉 Every case deserves a closer look.