B66-369 JEWELER'S DRILL. Whitney Patent. These cast iron drills with elaborate red and gold pinstriping were marketed by Tower & Lyon and are identified in advertising as "Whitney's Patent" although the only Whitney's patent that corresponds with the date is for a method of manufacturing drill bits. This one is 7-1/2" long, and the characteristic pinstriping is almost entirely intact with one small damaged area on the gear wheel. Good+ 150-300