That's what I thought but the 3b appears to have more parts (like a lift mechanism for the back stroke) than GETRIDAONEs saw. Mine looks identical to his. Also a 3Bs vice looks different. Were these things accessories back then?
I know this is an old post and probably won't get a reply but it's worth a shot. I have this saw and can't for the life of me figure out what model it is. Did you ever figure out what model Keller it is?
