In issue 172 of Royal Mail catalog Preview, are proposed objects of collection for fans of the Machin series :
* pin badge in silver reproducing the First class stamp (22,95 pounds sterling, circa 33 € or 46 USD) ;
* commemorative medal in silver, diameter 6 cm (£89,95) ;
* a document containing folders about Arnold Machin's arts and about the palette of the stamp series, plus a Machin stamp in silver (£48) ;
* and a medal first day cover of the Arnold Machin stamp. The medal's faces represent the famous effigy and a sculpted portrait of Arnold by his deceased son Francis (£14,50).
Fortunate amateur will be happy. I think it's more elegant than the Marianne des Français mug La Poste proposed in January 2005.