This is a Marchant "Silent Speed" ACR8D electromechanical calculator from the 1940s. It is currently jammed up, stuck on a division problem it never finished, and is apparently the most complicated mechanical calculator out there. Wish me luck!
Well this is disappointing. While trying to loosen up stuck mechanisms a few teeth broke off of an important gear. Guess this is now a parts machine.
@kyle probably the easiest path indeed, but given the common thread through which we met I would wager few who have met either of us ever expect the easiest path to be the chosen one!
@ajmartinez That would be fun. At this point I'll need to source a replacement gear at a minimum and then completely remove the control unit to reset all the interlocks. I think the easiest path is to find another parts machine and then make one good machine out of both of them.