![Image](http://tsauctions.com/bb/bu105.jpg)
Over the last twenty years or so I have seen a number of Pictorials (mainly lower values) and at least one QV Tablet with a double OS perfin. The mint example pictured above (sold recently at auction) has re-kindled my interest in this perfin variety so I thought that this BB would be an excellent means by which to compile a listing of "on which stamps", "mint and/or used" and "how many are known".
Please load any images of doubled OS perfins that you may have in your possession to this topic. Any information about this perfin variety would be of great interest as I plan to write an article on this topic that can be added to the TPS website at some stage in the future.
Ross