Sweden. E county. NORRKÖPING, straight postmark. Type 1 negative, on superb cover dated '1770' by pencil, sent to Stockholm. Used during the short time for the temporary placement of the Swedish parliament during 1769–1770. One of the most important Swedish postmarks during the prephilatelic period, allegedly only three recorded. Ex. Ingvar Pettersson. Ex. Kersti and Bertil I. Larsson.
