Tudor adds “Lagoon Blue” to the Black Bay 54 collection. This new model transforms the dive watch, which took ideas from old watches, into a refined timepiece that anyone can wear—it fits beach life and summer activities perfectly. The watch costs $4,350. While the new color keeps the 37mm size, it completely changes how the watch looks.
The Black Bay 54 “Lagoon Blue,” reference M79000-0001, keeps the original’s 37mm diameter and 11.2mm thickness—ensuring the watch wears well on a wide range of wrist sizes. Tudor has changed up several parts of the design, creating a softer, more current look for their smallest dive watch.
The biggest change is on the rotating bezel. Instead of the old black anodized aluminum insert, there’s now a mirror-polished steel bezel. The steel features a sandblasted 60-minute timing scale, and this polished surface matches the updated hands and hour markers. These now have mirror-polished frames containing white Grade A Swiss Super-LumiNova, replacing the previous gold finish.
The pale blue dial, with its grainy texture, gives the model its “Lagoon Blue” name. This color joins a wave of recent watches using similar “Tiffany blue” tones across the industry. Tudor itself offered a similar shade on the Black Bay Chrono “Flamingo Blue” earlier in 2025. It’s clear the market wants this look, even if plenty of brands are offering it.
Tudor also changed how the watch connects to the wrist. The “Lagoon Blue” comes only on a five-link stainless steel bracelet with polished center links, which is different from the original BB54’s three-link rivet-style bracelet. That older bracelet was a nod to Tudor Submariners from the 1950s. The new five-link design highlights the watch’s modern direction and keeps Tudor’s T-fit clasp for easy adjustments.
The Caliber MT5400 automatic movement stays the same—it offers a 70-hour power reserve and COSC chronometer certification, along with Tudor’s own accuracy standards of -2/+4 seconds per day. While it doesn’t have the METAS Master Chronometer certification found on some new Tudor models, the movement is still perfectly suited to the watch’s purpose.
Tudor’s advertising highlights the “Lagoon Blue” as a watch for a gender-neutral beach lifestyle. It’s not aimed at collectors who chase vintage-inspired pieces—just like Tudor did with the Black Bay 58 Burgundy and solid gold models. This shows Tudor’s move away from strictly history-inspired watches, aiming for a broader, more current appeal.
The $4,350 price is a small increase over the black dial bracelet version, reflecting the more complex five-link bracelet and improved finishing details. Even so, the watch is still reasonably priced within Tudor’s dive watch range.
