I am surprise at the condition of the lintel, grate, ash pan and other parts of that stove. They look like they have never been exposed to a coal fire. The fire brick obviously has seen a couple of good, hot fires.
The plate indicates that it is a 3720, certified to burn nut size anthracite coal in 1978. All of the cast iron parts show stove model number 2122. I know the 2122 had very similar specs to the 3720. My guess is this is a transition stove. Newer 3720s I've seen have the number 3720 in the places your stove has the number 2122.
I still feel your best bet would be to try to re-connect the nozzle and smoke box you have. Due to the modifications that were slowly implemented as they changed the model from 2122 to 3720 you may have difficulty finding parts that fit your stove.
It is a great little stove rated at 5kw (about 17,000 btu/hr). According to godin it can maintain a slow burn for 15 hours between tending. Good luck with it. Let us know if you find the parts or are successful at reconnecting the old ones.