Need help with hammer markings

[Tired Retired]

Need some help with the mark on this hammer. It came back on a carbine that CPM Armory repaired. Should be two pics, one with and one without flash on camera. Any one got any info? TIA -

Ed

Information

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[Milsurp Collector]

Made for Standard Products by Hawk Tool & Engineering Co.

[Tired Retired]

Thanks! I had never seen those paricular marks before, but I had guessed that the "S" made it an SP hammer. It came on a Postal mixmaster. I'm working on the data sheet and some pics now.

[Milsurp Collector]

If you have "War Baby!" there is a picture of the marking on page 466.