Tool Haul from Facebook Marketplace, a shed clearance, NOS and a mystery tool

I bought some tools from Facebook Marketplace, did a shed clearance and got stumped by a mystery tool. Do you know what it is? SUBSCRIBE TO MY YOUTUBE CHANNEL ►https://www.youtube.com/channel/UCbKPbit6iiRfkAvvGLCja8A FOLLOW ME ON SOCIAL MEDIA ► Instagram: https://www.instagram.com/essential_handyman/ Twitter: https://twitter.com/EssentialHandy1 Facebook: https://www.facebook.com/EssentialHandy1