Strange reamer designations

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I have some such reamers in my tool box that were picked up years ago at a garage sale or auction.
I estimate the size and drill a slightly smaller hole in some aluminum plate ( 3/8-1/2 ") and then carefully ream the hole and measure it and then put a tape wrap with size on the shank.
You want the work piece thick enough to use a telescopic gauge for measurement
Gauge pins would probably be even more precise if you have the blessing of owning them.

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