Steven Seagal wears a Chronosport UDT

Andrew Davis's Under Siege (1992) casts Steven Seagal as Casey Ryback, a former Navy SEAL working undercover as the cook aboard the USS Missouri when mercenaries seize the battleship. On his wrist is a Chronosport UDT, a quartz dive watch named for the Navy's Underwater Demolition Teams, the predecessors of the SEALs. It is a relatively obscure piece, built on the same analog-digital case and module as the Breitling Pluton of the era.

The Chronosport reads as a tool watch rather than a status piece, fitting for a former SEAL hiding as the ship's cook. The identification comes from a single watch-spotting site, and while a dark dive watch is visible in close-up, the brand cannot be read, so the Chronosport UDT stays a likely rather than a confirmed attribution.