Speargun Museum Turin on-line

[popgun pete]

This on-line museum has photos of many pneumatic spearguns which over the years have been discussed here and is definitely worth a look.

https://www.museosubacqueotorinese.com/collezioni/fucili-e-coltelli/

All propulsion types are listed, the spring guns and pneumatic guns, including some hydropneumatic guns, are presented with good photos of models in near new condition.