Nhbenz wrote:
> So combined with CBG's post I think 1924-1945 would be the range... I don't know if it can be narrowed further?
Nhbenz, it can't be narrowed further with absolute certainty. But we can use military-button production quantities for "statistical probability" of the button's period of manufacture.
As is typical for almost all of US history, at least until the ending of the military draft, after the US fights a war the army's size shrinks drastically, remaining quite small, until the next war happens. That was the case after World War One. From 1924 until December 1941, the army was quite small in comparison to 1942-45. During WW2, production of US Army buttons was at least 1,000% higher than it was from 1924-41. So, although it is possible that Dirtclad's "Rex Products" backmarked Great Seal button was manufactured in (let's say) 1927 or 1932, the statistical odds highly favor it having been manufactured during World War 2.