Flea market find, didn't have one so for 5 bucks I had to buy it.

I believe it to be a Stanley #41 clamp-on level, attaches to a straight edge.

Oddly the Stanley patent date, 6/23/1896, isn't for the level but is for the process of scoring the lines on the vial.

 

 

Beautiful.  Wonder what it cost to manufacture back then compare to what it might cost today.

I think that one for clamping onto a framing square. Nice find, I haven't seen many of them,before. We used the ones that hung on a string or wire years ago, haven't see any of those for a long time either.

12 hours ago, DuckSoup said:

so for 5 bucks I had to buy it.

No remorse either I take it? You at least wore a mask to cover the smile I assume?

 

BTW...sweet find. I've never seen one of those in the wild before.