Vintage Singer sewing machine adjustable seam guide with integrated thumb screw. A great feature is the plastic / nylon base so there is less potential to scratch the bed of your machine. 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 #161172 - Many are not marked, but are guaranteed to be a genuine Singer part.