He is inviting you to send in your philately to have it reviewed to establish its provenance.  Provenance is a quality seal – As in Art, Provenance is an indispensible attribute for valuable and important stamps.   Appointments are first come first served and will be held daily between 10am - 3pm. 

Karl has worked for over 35 years to develop the Great Britain Karl Louis Card Index and it his extensive knowledge and passion that allows the index to be maintained.  This index is by far the most comprehensive and important census of British Stamps in the philatelic world. Describing philatelic rarities calls for more than just quoting catalogue numbers and values. Provenance is a philatelic pedigree of former owners from the inception of philately until the present day. Those collections held in the highest esteem by their contemporaries and containing the great rarities, the modern day “Large Gold” exhibits can be traced back to the collectors who once owned the particular rarity and the auctions where they were sold and changed hands. Frequently, the further back a philatelic pedigree goes, the more coveted the rarity becomes. Provenance is a quality seal. 
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The Royal Philatelic Society London is delighted to announce they are an official partner for Virtual Stampex.  Comments below including sneak peak at what will be happening on their  booth from President Richard Stock.