This gearmotor is a miniature 24 x 12 x 10mm, low-current brushed DC motor with 9.96:1 metal gearbox, similar to Sanyo’s popular 12 mm gearmotors. These units have a 9.3mm long, 3 mm-diameter D-shaped output shaft.
Key specs at 6 V: 3100 RPM and 70 mA free-run, 0.22kg.cm (3 oz-in) and 1.6 A stall.