PROTO 4709T USA MADE SOCKET 1/4" DRIVE 9/32" 12 POINT no visible wear, could be some exterior blemishes as in scratches, may be engraving.
FYI -- GRIND MARKS OR ENGRAVING come about when the gov. issues a tool, it is engraved with some numbers by the person it is issued to. Usually before the tool is sold by the government the numbers are ground off, making grind marks.