Hows it going guys? Hoping someone recognizes this old beast enough to identify it. I believe its a 1970 model (I believe) equipped with a 192 Ford Industrial engine (also not positive on this, could be a 172?). Any idea where Yale would have stamped SNs around 1970? Cant seem to find anything stamped at all and need some brake parts and need to know capacities etc.

I believe its at least an 6-8k lift capacity but no data plates isnt helping...

Photos: https://drive.google.com/open?id=1Q-o8Y6-R_HOn67lNOk_R-t6v-RBpxzJ8