Does anyone know of why a M1 Garand would be marked "Trademark" on the heel? My brother received two Garands from his father in law. Both of them are really worn int the heel area. The serial numbers are ledgible, but the manufacturers are very faint. One is a Winchester, the other appears to be a Springfield. The Winchester is marked "Trademark". What is this? I have not seen the rifles yet, and all this info is second hand from my brother. I am wondering if these rifles are commercial, or de-milled re-welds or something odd? Thanks.