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John WojakLeon, if by "old Put" overstamped cards you mean the e98s with the Old Put stamp on the back, they are extremely rare. I have seen about 4-5 of them over the past 5 years, none of which unfortunately has made it into my collection. In a Mastro auction about a year ago there was a pair of e98 Cobbs, one with a blank back (which I now do own) and one with an Old Put overprint back which I believe is now owned by Doug Allen. I also think that Tbob has one (a Clarke possibly?).