#4 Brass toy windup key 1/8" hole. (measures 3.8mm)
#5 Brass toy windup key 3/16" hole. (measures 4mm)
#6 Brass toy windup key 2/16" hole. (measures 3mm)
#7 Brass toy windup key 3/16" hole. (measures 4.5mm)
#8 Brass toy windup key 3/16" hole. (measures 5.2mm)
Schuco vintage toy token or Key
