I know my Grandfather used to give away lots of old machines back in the day to friends of his who wanted to make a smoker out of one....we had an old Vendo 81a up at the cabin that was used to smoke fish... it was long gone by the time I started realizing what it was , but remember it clearly..
So you put in a dime and pull a walleye out of the bottle stack. I would guess the 81 would make a more popular smoker since it is not just a single flavor smoker and you can smoke up to 12 oz fish, not just the smaller 8 oz ones.