Your truck is a 1972 model. Mrfixit is correct it should be an H50F, assuming that the "50" decla on the side of the truck is correct. This truck was made in capacities ranging from 3000# to 6000#. You would have to contact your local Hyster dealer to get a capacity plate, however if the truck is equipped with an attachment that was not on the truck when it was manufactured you will have to positively identify it by manufacturer and model # in order to get the correct capacity plate.