Samsung turntable motor 21 V AC.
Specifications:
21V AC 50-60Hz :-- NOTE LOW VOLTAGE
5-6 RPM
2.5 W
4.6 mm terminals
Drive shaft length 13 mm
Drive shaft diameter 7 mm, with a "D" shaped cross section.
Alternative markings may be M2HJ49ZR02, or ST16 (EX73MAAA)