This is a Stanley H61-B jig prototype blank with a serial number, perfect for making dove tail joints. It is an vintage tool that has been well taken care of and can be used for restoration and care of other antique items. The intricate design of the tool allows for precise cuts and perfect joints, making it a valuable addition to any antique restoration collection. Whether you are a collector or a craftsman, this tool is sure to impress and improve your work.Good condition and comes with a 60 day satisfaction guarantee. Currently available youtube videos on how to use this item on the internet.