Up for your consideration is a vintage Grove Manufacturing Company Dividers. 4 1/2″ long. Years ago I saw an add in an old mechanics or metalworking journal a story about these dividers/calipers. They have an indicator built in. Kind of a no-go gage  sort of.  Take a close look at the pictures for more info. Everything works as it should. I was given these years ago by a retired machinist.  All sales final. Any questions please ask.  Thank you for bidding. Have a great day!