Hi Parabola, I wish it were the case that this double was one of the prince's presentation pieces. My understanding is that following Dougall's receipt in 1872 of a royal warrant from the prince, that Dougall's guns bore the 3 ostrich feather symbol of the Prince of Wales. But this applied to all Dougall's higher grade work and does not show an actual connection with Edward. I am only repeating what I've read, not confirming its accuracy.

https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=399175