1931-36 Rex midget 98 cc, model A, 2-speed
Dimensions according to catalog Cyl.dia STD 50.00 Comp. Height 25.11 + 14.29 mm. Piston bolt dia 12.50 mm.
It says semi-finish on the carton and then it should be a piston to be ground to the dim. one needs.
Diameter piston about 52.3 mm surface rust in smaller amount on certain pistons
Piston rings are not included