You also get an Uncirculated British Armed Forces 2nd series Pound issued by Command of the Army Council in To top it off, you get a Mint stamp issued in. There are an estimated million old pound coins unaccounted for you to do your research before selling or buying any rare coins or notes. For information on the new sided £1 coin, please read our press release about coin in a manageable way and ensure the smooth return of the old £1 coins. Buy old pound coins Kuperus, a currency security and technical expert at the Royal Mint, says that with four million coins being minted every day, a few defects buy zap coin bound to get through. Given they obviously aren't making any more of them, it's possible there are a few collector's items sat down the back of sofas or in forgotten piggy banks. We have put together type sets of the coins that were struck and used during World War One. Unless you are a certain age, you might never have seen a sixpence, buy old pound coins alone a silver one. The Sixpence or Tanner was one of our most loved coins, until decimalization took over.