Vintage Singer sewing machine adjustable seam guide, Simanco part #161172. This is the all metal version with the integrated thumb screw. Compatible with most older Singer machines including the 301, Rocketeer, Slant-O-Matic, etc. *Please be aware that the longer screw on this guide is not compatible with some later models (mid 70s onward). Very nice vintage condition with minor signs of age, rust free. Genuine, 60s era Simanco / Singer guide