The Hamilton 15 is an automatic watch movement introduced and used predominantly between 1959 and 1967. It features a mobile stud carrier, which replaced the fixed stud carrier in 1964. The movement incorporates an indirectly driven minute function, enabling a larger balance wheel and a lower overall profile. Not much information is available regarding the exact differences between the 2365, 2366, and 2368 variations of this movement. Noteworthy functions supported by the Hamilton 15 include sweep seconds, offset center wheel, and an automatic winding mechanism. It does not have a second hand.