This is an old Starrett #11 tool for machinists, tool makers and pattern makers. It is labeled as a 6” combination square with center head with a hardened blade. The square head and the center head are stippled castings with the black Japanned paint finish and they both have a knurled lock. The square head has what is called a spirit bubble level and it has the original scribe inserted in the top. The 6” blade has the 4R graduation; 8th, 16th 32nd and 64th increments with 1/8”, 1/16”, 1/32” & 1/64” markings on alternating sides. The un-grooved side of the blade is marked with; No.4 Grad. - The L.S.Starrett Co. - Athol Mass. U.S.A. - Hardened. I believe this is from the early 1900’s. It comes with the original box which has a label that identifies it.
As stated, the blade measures 6” long by about ¾”. It is in very good condition minimal signs of having been used. There is minimal discoloration to the steel blade. The level bubble is intact and functioning. The box measures about 4” by 6 ½” by 1” and it is in good condition with minor edge and corner wear and light soiling.
The pictures are not shown at actual size. Please refer to the description for actual measurements.
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Vintage Starrett Tool - No.11 6 inch Combination Square with Original Box