Corum Admiral's Cup Leap Second Watch. Housed in original case. Comes with the documents as well. The back of the watch says the Admiral's Cup Chronograph Water Resistant 10 ATM, 01-0034, Swiss Made 2231029, A 544/750. 
Created in 1960 the iconic Admiral's Cup is synonymous with performance and refined technology. The powerful dodecagonal case design of this corum timepiece is identifiable at first sight. The Admiral's Cup is the only watch ever with the International Nautical Pennants of the Dial. 
As a mark of authenticity, the watch has an international code number engraved on the back of the case. 

Size: 5 x 5 x 3 in.

Corum is a Swiss luxury watchmaker founded in 1955 in La Chaux-de-Fonds by René Bannwart and Gaston Ries, known for innovative designs like the Coin Watch, worn by U.S. presidents and Andy Warhol. Its most iconic collections include the nautical-inspired Admiral’s Cup, the technically groundbreaking Golden Bridge with a linear movement, and the bold Bubble with a domed sapphire crystal. After changing ownership multiple times—including a period under Hong Kong’s Citychamp group—Corum returned to Swiss hands in 2025 through a management buyout led by CEO Haso Mehmedovic. The brand now plans a global relaunch focused on creative watchmaking and restoring its position in high-end horology.