These photos show the location where the truck serial number can be found stamped into the frame.
235 Series Trucks
Cushion Tire Trucks
2,000 lbs. to 3,000 lbs. Capacity
Models:
C500-20
C500-25
C500-S30
C500-30
C232L Series Trucks
Cushion Tire Trucks
4,000 lbs. to 6,000 lbs. Capacity
Models:
C20C
C25C
C30C
Clark Clipper - Model CE
Y685 Series Trucks
Pneumatic Tire Trucks
6,000 lbs. to 10,000 lbs. Capacity
Models:
C500-Y60
C500-Y70
C500-YS80
C500-Y80
C500-Y100