u/Best-Operation-1791

So can anyone tell me about this. I got it from sn 80 yesterday old mechanic, welder, machinist all around working man who got/made it new id saybat least 50 years ago when he worked for caterpillar. But that's i know. I got it home and it wont fit the only area it can go in the shop, so i have to sell it. I want to give the old man half of whatever i get so need to figure out the value as well.