The product is a Belgium 1976 Inaugoration of first Metro Brussels line full sheet plate # with an OCB/LUPPI variety extra door light on the 2nd door stamp 26, which is a rare error stamp from the era of Queen Elizabeth II. It is in Mint Never Hinged quality and features a multi-coloured design related to trains and railroads. This stamp is a unique piece from the decimal currency era of Belgium, making it a valuable addition to any stamp collector's portfolio.