Seeing as primers are high on the list of topics at the moment, I thought I would go through my box of bits and see if I had anything that may be of use to someone else. The only primer I have is marked: DJ 52 1Mk2 WWR and 7H CY 10 52.
I have included some pics, but a couple of the letters are a bit hard to read. Approx measurements are, base dia: 34mm, top dia 23mm and height 22mm. Shells and cases are not my field so please go easy on me if I have made a mistake ! Tony.