B68-364 PULL CHAIN DRILL. Uncommon variation on the bow drill in which the drilling motion is produced by pulling on a spring-powered armature that automatically returns. There are a few versions around but all are uncommon; this one is 13-1/2" long with a japanned cast iron frame and wooden handle, drum and knob. Unmarked. Japanning is about 80%, wood has moderate wear. Return mechanism doesn't seem to be working but looks like a little lubrication and adjustment would do the trick. Good 120-240