Grip ID Help

[Tony Sandrin]

I recently picked up a set of replacement grips. The seller stated that they are Mauser made, 40's grips. There is a stamped M or W on the right grip panel as well as what appears to be faint WA655 Waffenamts on both grips. I was under the impression that Mauser replacement grips would have been stamped with a 42 or S/42 rather than an M. Any insight on what I have?

Thanks for the help!

Tony