I have a very rough one...that the P/C are shot. Case/tank are fine just ugly (scratches etc...), no chain brake. I couldn't tell you if it's 10 or 12mm. I can check serial # if that helps. 100 bucks shipped?
I wouldn't trust the crank seals...bearings no promises turns smooth. Everything there but the brake. Won't be till Monday but sure. Nothing to look I can assure you that.