For your consideration we are offering this Rare Early Antique Vintage Graduated Cut Off Tool Craftsmen Machinery Co. Boston Mass. This possibly unique item will be the talk of your vintage tool display or collection. This item appears to be for precision cut-off of some kind. The handle is marked on one side “Craftsmen” Jr. and on the other side Craftsmen Mach. Co. Boston Mass. U.S.A. . The measurements on the sliding rule are starting at 5 and ending at 60 in 5s but the over all is just under 12? on the rule. I find no patent date or information on this piece. This is made of cast iron and is bench mountable. There is an early braze repair to the hinge end of the spring loaded handle. Please see pictures for more details.