It is easy, you omit a decimal point like I did. @ of the more common models for the early 1970's were either a 1.250cwt or a 1.375cwt, if that helps you out. But on all the ID tags that have been posted there is no decimal point seen.
Will have the hand brake sorted by Monday and the crank handle now has a bracket to sit into and the fuel leak has been stopped. Such progress.