The Model 1 was sometimes called the Junior, made from approx. 1930.
Tinplate construction, it was cocked by breaking action at the rear of the gun, where two thin rods pulled the spring assy. and engaged the trigger sear, pellets were inserted into a separate barrel assy. which was a removeable affair at the gun, finish was either nickel or blued.
I guess not many will have survived as they were more of a childrens toy, rather like a Pop-gun.
I hope this helps you in your quest.
Atb.
Robin.