to compete against the 1 and 2 Pa'anga notes that were simultaneously issued so production of these denominations ended in the 1980s due to low commercial demand. All 1 and 2 pa'anga coins still remain legal tender but are rarely used. in 2002, nickel-plated steel replaced cupro-nickel in the 10, 20, and 50 seniti and the 5 seniti in 2005. The change did not occur in the 5 seniti initially as there was still a reasonable quantity of coins in stock at the time of the change. The move was made to reduce costs in production of the coins. The weight of the coins was also slightly reduced, although they remained the same approximate size as earlier dated coins. In 2011, commercial demand for 20 and 50 seniti prompted these denominations to be issued featuring the effigy of Tupou IV posthumous, who had died in 2006. A new obverse design for George Tupou V had not yet been made or selected at this time, possibly due to increased health concerns regarding the latter monarch, who died in March 2012. For a brief period, some of the higher denomination coinage from the 1967–1968 series was "countermarked" with commemoration stamps that were added to the coin after being struck. The most distinct of these is Oil Search series which was plated in gold or "gilt". Some countermarked pieces were released into circulation but many were also sold to collectors. Current circulating coins are in denominations of 1, 2, 5, 10, 20 and 50 seniti. The one and two seniti coins are still valid but are becoming less common in circulation due to high production cost and low value and may only be readily available for months after a release by the banks. Total prices in shops are usually rounded to the nearest 5 or 10 seniti. In 2011, Tonga had announced plans to introduce a new and more modern series of coins shortly after neighboring Samoa and Fiji had done so, and on 3 March 2015 the Royal Australian Mint announced the production of new coins that would begin release later that year. Dignitaries, including Tongan Princess Angelika Tuku'aho whose father will feature on her county's coins, took turns striking the coins at a ceremony. "I'm very proud and honoured to be able to strike the coins today," she said. "This is also in celebration of His Majesty's coronation that is coming