Got a nice pair today but can't find much about them on the web.
Are they scarce?
I found one thumbnail, but it is too old to open.
Nothing on the bay or AA about them.

Hello, Northwoods. I found this on the Internet Archive. Photo is from a Plomb / Proto Catalog 4820. I hope this helps, Lou

Thanks, Lou. 
Looks like I have the larger one.  Now to find No. 266....

Glad to assist in your quest for another Plomb tool!!!