I also have an RBL 28, but can't locate a photo. Here are a few others from the safe. Two other AyAs, including a Number 2 are also not present.
Below are my John Dickson and AyA #453. The Dickson was the gun I used almost exclusively for many years and which has taken the vast majority of my birds from days when we had birds. It's a 1930s gun, and Jack Rowe told me he knew one of the workers whose mark appears on the gun. The AyA was a stand-in gun that I used after I broke the stock of the Dickson (the stock you see is a Jack Rowe made replacement). I had visited Mr. Rowe in Enid, OK the prior year to have a dent removed from the right barrel of the Dickson (slipped on an icy bluff while grouse hunting in NE Iowa). When Jack saw the broken stock he admonished me, "You shouldn't be allowed to have this little gun!" He was probably right.
This thread has produced some great stuff. Thanks to those who have posted...and keep 'em coming. I'm still searching for a photo of my DHE.