A bunch of these old chucking reamers found their way to me, No. 8 and 10, all with this tear drop base. I can't find them anywhere. The imprint says "Drill USA No.8". Curious!
Don't think so: I have probably 20 of them, mostly 8 and 10, all with the same shank, from different sources that have found me. They wouldn't all be worn the same way, I wouldn't think.
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