Postal stationery can be overprinted by the government or, occasionally, by a private overprint. Stamps without overprint are unissued remainders. They were Finnish definitives from 1917 with overprint Aunus. The 1948 stamps were reissued but with an overprint. This flight was notable for transporting mail bearing a surcharged stamp as a commemorative overprint. In 1953, six stamps were reissued with colour changes, still bearing the overprint. In April 1900 German stamps with "Samoa" overprint became available. There are hundreds of different stamps with many varieties of overprint. A forger may just "overprint" a common stamp of the period. One stamp in each sheet had an error such that the overprint read "One Pnney". Most often, though, specimen markings are applied as a prominent overprint. Stamped to order postal stationery was also produced with the "Russisch-Polen" overprint. The overprint appears on the watermark area on all six circulating denominations. Forgeries of the overprint are known. Black ink is set to "overprint" colors in the background.