Shawn, actually Steve & I know each other quite well from another forum, I don;t frequent this one and would not have found this thread if not for an email from him!
Here is some info from our correspondence that might be of interest -
"The Gold Medal (& other grades) were still all listed for the 1903 & 1914 as late as catalog No 60. It seems to be well accepted that there were only 1000 1903's made after WWI and that was in 1922, I would put this gun before WWI (1914 to ~ 1916). The highest pre-1914 style I have is 138912 and the lowest 1903/1914 style is 142256. I lettered my no. 146955 and it is one of the 1000 from 1922 - I doubt it was the last of those 1000 but if it were then the lowest post-WWI number possible at would be 145955 and going the other way the highest pre-war possible at 146954."
From the numbers, even thought there are some big gaps, I come up with an estimate for the most of this style of 1903 that could have been made by taking one of the last 1000 made and assuming it to be the 'first of the last' I added 1000, then taking the highest I know of the previous style and adding 1 I get (146955 + 1000) - (138912 + 1) = 9042 which is not a lot ... and to have one of those few that's engraved is really got to be rare. Going the other way lowest production estimate for this style would be higest I know minus the lowest I know or 146955 - 142256 = 4699, which is really low.
Here are a couple to compare with to see how the engraving varied - one from 1908 and one from 1910