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Jim TI have a Durham Seovereign back but cannot tell what series it is from because there is a piece of scrapbook stuck to the back where the number of subjects is listed. However, I have another Sovereign 350 back that came from the same "find" that has the same glue and scrapbook paper and is a 350 series. It is possible, if their were glued by the original collector, that they may be the same series.
I have never tried to get the paper off the back because the card is pretty poor even if I could get it off. I'll take a closer look to see if I can loosen it up enough to determine which series it is from.