X1 11 teeth. x1 12 teeth. x2 x13 teeth.
Meccano Part 103j Flat Girder 13 Hole Zinc
Meccano Part 27a Spur Gear 57 Teeth and Part 26 Pinion 19 Teeth.
Meccano Part 27 Spur Gear 50 Teeth and Pinion 25 Teeth Original
Meccano Clockwork Motor Pinion With 13 Teeth Part 26r
Meccano pinion 11 teeth, ¼" face, part 26nd
Meccano Part 25 Pinion 25 Teeth ¼" Face Original
