This first one is different from all the rest, in that it does not have a serial number. instead, the wide white band at the top and the imperf partial stamps are all that tell us it is a tab sheet. I have not seen the other 2 stamps of this issue in tab sheets, although I have seen what appear to be cut down sheets of the regular issue (with perforated partial stamps at the top) offered on E-bay. Since anyone can take a paper cutter to a regular sheet to create those, I question their authenticity. Even if they were authentic, I would question there collectibility, since it would be impossible to tell if they were legit or were created form the full sheets by the seller. Unlike the first issue, the serial number at the top of this perforated tab sheet is fully intact and visible.