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'frit' noted letter originally franked with 4 sk. bicolored Ib printing (1870) cancelled with numeral '89' Marstal and datestamp 'MARSTAL 24/2 1871'. Due to the 'frit' manuscript in lower left corner, the letter was subject to full unpaid rate of 6 sk. Thus, when bringing the letter to the counter af the post office, the clerk noted the franco marking, and sender was obliged to pay the missing 2 sk. - and then an additional stamp of 2 sk. lineperforation 12 1/2 1864-issue added. An extremely rare postal history item.