This 3 inch Henry Disston & Sons No 1 square is in used unmolested condition. You could clean it up and make the brass shine but this one has made it a long time with the patina intact. It is an early one for the & Sons mark not having the groove in the body, scarce 3 inch size as well.

For information on old tools the resources at Mid West Tool Collectors Association are top notch. They have links collected there for everything antique tool related.
https://mwtca.org/useful-reference/

Make sure to check out my other items, I will combine shipping just wait for the invoice. I am in a selling mood, it's not Christmas yet but schit has to go, offers is set to let me see offers that I don't think I'll take, might change my mind..........