I cannot find any reference to another 10d example. Perhaps only single color stamps were printed with aniline ink? While showing characteristics of an "aniline" ... the design showing clearly from the back... there is the possibility of "over-soaking" when taking it off paper. The GUILDFORD CDS shows discoloration and blurring at the top for instance. You could float the rest of the paper off and try using a UV lamp which would make the aniline ink fluoresce.
I'm not sure if I will remove the rest of paper. For me, a part of paper like that on back confirm it is not an "over-soaking" stamp :-). Anyway, it is an interesting stamp.
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