A couple of photos would help Al... but from your description, my best guess is that someone at some time in the past had your Luger in a vise  and the diamond pattern was on the jaws of the vice... but show us a couple of photos and it will be easier to determine.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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