The Machin Decimal Stamp 10p Orange Brown Block of 25 is a rare and collectible item dating back to the 1970s. Featuring Queen Elizabeth II, this mint never hinged stamp showcases a vibrant orange brown colour, making it a valuable addition to any stamp collection. With a denomination of 10p and a block width of 25, this stamp is a unique piece of British postal history that captures a significant era in the reign of Queen Elizabeth II.