GG's

Just created a Flickr album showing a front and side view of a mystery (
presumably ) leatherworking tool.

https://flic.kr/s/aHBqjA2vxJ

The business end looks like it would cut a narrow square-sided groove.

The purpose of the offsets, and the adjustable brass parts, is a total mystery.

What was this tool used for?

Best Galootish Regards,
John Ruth