What is it?

[oldgoaly]

My wife sends me some pics of this "tool" says it's jamax. So I did get her to  put a tape by it for reference. She was at a antique bottle club meeting.
I haven't seen it in person, no idea what it does other than cut something or shave it.It says "Jaymax" on aluminum handle part.

[Bill Houghton]

No idea, but the interweb tells me Jaymax Supply was a wholesale plumbing supply house.