03A3 "I" Cartouche?

[Metacomet]

Is this a cartouche, and if so, what does it denote? I took off her repro sling tonight to replace with an original 1907, and I saw this mark for the first time, it has escaped me all these years. The stock is really nice and the mark is really crisp, so I assume it's a cartouche and not a dent. I did a google search and could find nothing on this mark, so it's time to ask the experts. Thanks guys.

The rifle is a June 1943 Remington. The stock is pinned, with a "no box" FJA, crossed cannons, circle P.

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