Three O Will gallery air pistols

Three O Will gallery air pistols 

With thanks to John G.

He says:

This is actually how they left the factory. They were intended only for fairground/ gallery/ shooting game use, so sights were deliberately left off (notice no dovetail for a sight), and trigger guards were an unnecessary expense as the guns were always tethered (there are no drilled holes for a trigger guard). The bottom one with the barrel groove does have sights and trigger guard, but the groove is a giveaway, as it was also part of a tethering system.

These pistols also have unusual calibres, so punters could not use their own ammunition. Airguns like this are peculiar to Germany, where airgun shooting in inns, hotels, arcades, fairgrounds was always very popular.