Lance,
Welcome to the Forum.
Well, the answer is any of the above, including an option that Brown Bakelite grip panels could be used.
Seriously, most 1940 production is found with serialized grip panels but some have only Eagle 655 stamps. Both are considered correct. And to complicate things further, its clear from research that Mauser did not necessarily serialize every grip panel that left the factory.
The brown Bakelite panels are seen in letter suffixes y and d and g through k. These were surplus grip panels acquired by Mauser from Krieghoff once Krieghoff had completed their first Luftwaffee contract.
Hope this helps.
John
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