Tudor was founded in Geneva in 1926 as a sister brand to Rolex, built to offer Swiss-made professional tool watches at a more accessible price point. The Black Bay 54, introduced in 2023, is the most historically faithful watch in Tudor's modern catalogue: a 37 mm diver that traces its proportions and DNA directly back to the Tudor Submariner references of the early 1950s — the very watches that inspired the Rolex Submariner itself. The "Lagoon Blue" variant, introduced in 2024, adds a striking aqua blue dial to that purist formula — a colour evocative of shallow tropical water in strong sunlight.

Reference 79000 is a 37 mm stainless steel automatic diver's watch, 11.2 mm in thickness, with a polished and brushed Oyster case and a screw-down crown bearing the Tudor rose in relief. The lagoon blue domed dial carries a distinctive sand-textured surface, gilt dot hour markers and Tudor's signature snowflake hands with luminescent inlay, finished with a lollipop-tipped central seconds hand — a detail directly inherited from the 1954 original. No date window interrupts the clean layout. At its heart beats the Tudor Manufacture Calibre MT5400, COSC-certified, with a 70-hour power reserve. The domed scratch-resistant sapphire crystal sits above. The unidirectional rotating bezel features a mirror-polished steel insert with no minute graduations — a period-correct choice that reinforces the vintage character of the watch. Water resistance is rated to 200 metres. The watch is fitted on a five-link stainless steel Jubilee-style bracelet with a flip-lock deployant clasp.

This Tudor Black Bay 54 Lagoon Blue is in very good condition and comes as a full set.