Stanley No 91 Marking & Mortise Gauge Vintage Original Carpenter Tool

A mortise gauge is a woodworking tool used by a carpenter or joiner to scribe mortise and tenon joints on wood prior to cutting. Mortise gauges are often made of hardwood with brass fittings. This gauge is all metal. 

Approximate weight & measurements:
6 oz.
6 1/2" by 2" by 2"