[Researcher]

The heart and the sunburst are a couple of the most common Remington era inspector's (?) marks. Russ's gun has an XH date code -- X = December H = 1939. My 16-gauge 1-frame has an XJ date code -- X = December J = 1940 (edited) -- and it has the heart and sunburst marks.

241968 01a 26-inch, 16-gauge, XJ X = December, J = 1940.jpg

There are a lot of other marks I've recorded as well --

238428 02.jpg

241331 EG E = Oct., G = 1938.jpg

240305 XG X = December G = 1938.jpg

240003 BF B = January F = 1937.jpg

240647.jpg

237731.jpg

242353 LL L = February, L = 1942.jpg

There are more, but not sure how many pictures I can attach.