HC
location unknown
mold: diasqr, plain, sm-key

HC (Hawthorne Club)
Hawthorne, NV
mold: RCTHRT

There are numerous other HC chips listed, but none of the others are small key and none of the others are Hawthorne Club.

The seller says he used the revised edition of TGT (which I don't have handy), The Audit Edition (which I used) is newer.