The Felsa 366 watch movement, also specified with 19 jewels, incorporates 3 jewels to minimize friction between the date disc and base plate. The movement utilizes combined settings for the escape wheel, and any differences between R2628 and 2628.H are not known. Its functions include manual wind, sweep second, day display, and quickset date adjustment by repeated pulling of the crown. The movement was commonly used around the year 1980.