The product is a vintage L.S. Starrett outside 5" caliper, made in Athol, Massachusetts, USA. This high-quality machinist tool is a collectible item known for its durability and precision. The Starrett brand is highly respected in the machining industry for producing reliable and accurate measuring tools, making this caliper a valuable addition to any collection or workshop. OD caliper is used is old and needs cleaned but not lose or worn out hinge is still nice and snug and functional