The 1p and 2p coins from 1971 are the oldest standard-issue coins still in circulation. Pre-decimal crowns are the oldest coins in general that are still legal tender, although they are in practice never encountered in general circulation. Coins from the British dependencies and territories that use sterling as their currency are sometimes found in change in other jurisdictions. Strictly, they are not legal tender in the United Kingdom; however, since they have the same specifications as UK coins, they are sometimes tolerated in commerce, and can readily be used in vending machines. UK-issued coins are, on the other hand, generally fully accepted and freely mixed in other British dependencies and territories that use the pound. An extensive coinage redesign was commissioned by the Royal Mint in 2005, and new designs were gradually introduced into the circulating British coinage from summer 2008. Except for the £1 coin, the pre-2008 coins remain legal tender and are expected to stay in circulation for the foreseeable future. The estimated volume in circulation as at March 2016 is: History of pre-decimal coinage The penny before 1500 The English silver penny first appeared in the 8th century CE in adoption of Western Europe's Carolingian monetary system wherein 12 pence made a shilling and 20 shillings made a pound. The weight of the English penny was fixed at troy grains (about 1.46 grams) by Offa of Mercia, an 8th-century contemporary of Charlemagne; 240 pennies weighed 5,400 grains or a tower pound (different from the troy pound of 5,760 grains). The silver penny was the only coin minted for 500 years, from c. 780 to 1280. From the time of Charlemagne until the 12th century, the silver currency of England was made from the highest purity silver available. But there were disadvantages to minting currency of fine silver, notably the level of wear it suffered, and the ease with which coins could be "clipped", or trimmed. In 1158 a new standard for English coinage was established by Henry II with the "Tealby Penny" — the sterling silver standard of 92.5% silver and 7.5% copper. This was a harder-wearing alloy, yet it was still a rather high grade of silver. It went some way towards discouraging the practice of "clipping", though this practice was further discouraged and largely eliminated with the introduction of the milled edge seen on coins today. The weight of a silver penny stayed constant