This is an antique stopwatch from BREVET CELSIOR SWISS. 【BREVET】 means "patent" in French. Many Rolex models from the 1950s to 1960s were marked with "BREVET." It was mainly stamped on the case side (12 o'clock side), and it is famous for being stamped on the 8mm diameter "Decaluse" used in early Submariners. The dial is marked "CELSIOR (supreme, highest) SWISS," and has a retro atmosphere. Overall, there are scratches, stains, and deterioration of the dial due to aging. It has no crystal and is non-functional, so the condition is poor, but it seems to be a valuable piece. Collectors, please consider it.