I. (Ignác)Wangler z Kutné Hory was the son of Jan Wangler but I'm not sure if the advances in technology didn't prohibit him from utilizing his father's design. Yeah, these off the wall designs & examples are most addictive. I'd say that w/ the images & the info that this topic could warrant a submission for publication in the beloved DGJ or Double Gun & Single Shot Journal.

Cheers,

Raimey
rse