Some SK Logos:




These stamps were used on SK Tools to mark tools. The were acquired at the
auction of the SK facility in Chicago when it was closed.
The top one reads: 45310-S-K-5/16-U.S.A-
The bottom one: 45312-S-K-3/8-U.S.A-

This is a cam type stamp. It reads:
7/8 S-K 61996996 USA