Haenel Model-28 Air Pistol.
Courtesy of Leonardj.
Len said: "This is probably the nicest specimen of the Haenel Model 28 pistol that I had ever seen, and was thrilled to have been able to add it to my collection."
A close up of the instructions for use on the underside of the box lid.
With thanks to John Z for this pic.
Haenel Model-28 - cocking arm torsion spring fix
Thanks to Guy and Jim for these pics of a modern replacement spring that keeps the cocking arm pressed up to the piston so it does not fall out of the cocking slot.
Haenel mod 28 - long barrel, boxed
With thanks to a collector friend for these pics.
Haenel expert Bruce Jr says "to date there are still only 3 long barrel 28s known at this time. #10086, #18286, and [the one pictured below] #18427 which is the only known boxed example."