arbalete
window display??? well maybe, it depends on what you want to use it for. The champion came in a lot of different lengths. Mine is 30+ years old (I bought it new) has a 36 inch shaft, was made for US Divers (I think), still works fine and looks a lot like the previous picture, except for the line release and it has a plastic spreader bar for the bands The trigger mechanism/line release is very strong and durable, I have sure abused mine beyond any reasonable limit Overall, the gun is very reliable , but not very accurate, no where near the better guns today. Eventually, if you use it a lot in salt water, the scew holes on the barrel begin to rot out where the stainless screws set up an electrical reaction.
Mine started out as my main gun, but after I got a much more accurate shooter, it became my rock gun, going after grouper in holes, where accuracy ( or a straight shaft) didn't matter and a line was necessary. I only used it every other trip or so, but took a whole lot of fish with it, including some big ones, black grouper 50 pounds plus and a triple grouper shot . I would use it still, if doing that kind of diving.