The chip (diamond mold) is from 1003 Walnut to go along with the small keys you might have in your collection.

Is there solid proof, not at all. I did get these chips in the same lot as the 1003 Walnut chips with the small key (white and blue). That's good enough for me. That's as good as it is going to get. There are no manufacturers records for small key either but what else would 1003 Walnut stand for

The Ten 0 Three does look a bit better scanned than the chip does in real life, just to be honest.