Squale Medium 30 ATM Ref. 1515 is a Swiss-made dive watch that is known for its robust construction and reliable performance. It is a popular choice among divers and watch enthusiasts for its classic design and high-quality components. It has a unidirectional rotating bezel that allows for easy tracking of dive times, as well as a screw-down crown that ensures water resistance to depths of up to 300 meters (30 ATM). The dial of the Squale Medium 30 ATM Ref. 1515 is typically black or blue, with luminous hour markers and hands for improved visibility in low-light conditions. The watch also has a date function at the 3 o'clock position. The movement inside the watch is a Swiss-made automatic movement, which provides accurate timekeeping and reliable performance. Overall, the Squale Medium 30 ATM Ref. 1515 is a high-quality dive watch that is prized for its robust construction, reliable performance, and classic design. Its water resistance and unidirectional rotating bezel make it a practical choice for diving and water sports, while its vintage charm and distinctive style make it a popular choice among watch enthusiasts and collectors.