I need to know if anyone can properly date this forklift and I also need engine and HP ratings. A specification sheet would be greatly appreciated as well. Usually there is a number is in front of the "FG35" but there wasn't a number in this instance.

This is a gas engine and I found a nameblate on the block:

Okamura Mfg. Co.
Model: Y50511X
SN# 4090790


Thanks in advance!