New Old Stock Mitutoyo 3-4" Disc Gear Tooth & Flange Micrometer. .001" Grad. 123-128 Japan Sherline 5mm-19mm 55mm length Hex Socket:

5mm-19mm    55mm length Hex Socket: 5

Made in USAJacobs is the premier maker of chucks

9"x11" size

These have been in storage since the 1960's

The back plate is for 12" chucks but does not measure 12" across

New Old Stock Mitutoyo 3-4" Disc Gear Tooth & Flange Micrometer. .001" Grad. 123-128 Japan Sherline 5mm-19mm 55mm length Hex Socket:New Old Stock Mitutoyo 3 4" Disk Micrometer. . 001" Graduation. Part number: 123 128. Made in Japan Disc flanges on micrometer make it possible to get accurate measurements on areas not reachable with standard micrometers such as gear pitch, ribs, slot and groove distances. Measuring the root tangent length of spur and helical gears. Comes complete in fitted wooden box with adjsutment wrench and standard. The foam in the box may be starting to