I note you refer to a “bird” in the DWM headstamps. I think this is meant to be considered a “flaming bomb” symbol.
We had one of these 47 AE in a sale awhile back, & for what it is worth, it was sold as a flare (empty case) & I didn’t hear back anything different.
Glad to hear you had a good show & are out & about.[/quote]
yes it is a flaming bomb, you are right.
About me, “till no DWM document is found proofing the opposite”, it is a 4 gauge shotshell at the origin which was used later as a flare.
The same way the frenchs and the britishs did with their 4 gauge shells.
About the Britishs they even did the same with their 1 1/2 punt gun cases (which were originaly with a length of 8 1/2 and 9 3/4 ) to use in Very pistol with lengths of 4 inches, 8 1/2 and 9 3/4
In the Eley drawing for exemple the title is “punt gun ctge case for Very pistol ctge” and show lengths of 4 , 8 1/2 and 9 3/4 inches.
But if you take a look on the same drawing number, but older, you can read about the title : "punt gun ctge case " and show lengths of only 8 1/2 and 9 3/4 inches.
In such a way they took a case originated designed as a shotshell to used it in a flare gun.
And you have of course shells which were never designed to be used in a shotgun but designed specifically from the beginning to be used as flares .
Very often the dimensions (rim and so on) are slightly different in order (at least in the beginning) not to enter a shotgun and these dimensions don’t have to follow standards (for the country or international).
And these last ones for me are typically flares shells, not shotshells adapted for economic reason to flare use.