I don't think so, This is speculation but I believe there may have been periods during production where numbering of grips was not a priority, but the Mauser experts will soon speak up and let you know the best data that is known on your question.
Another reason that a gun might not have marked grips is that they may have been replaced by a unit armorer because they split or became chipped (like up near the safety on the left grip) or just because the armorer had a nice looking pair of grips and wanted to be on the good side of the guy carrying the gun...
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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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