Great Britain 1840 2d blue combination usage with 1841 1d red-brownThe finest known of all 2d blue and 1d red combination usages. Unique as the only cover known with the 1841 1d red brown plate 1b. Great Britain 1840 2d blue and 1841 1d red brown combination cover The finest known of all 2d blue and 1d red combination usages and unique as the only cover known with the 1841 1d red brown plate 1b CE and CK, SGDS6, AS6. The letter was sent on April 28th 1841 from Cork to Dublin with two stamps re affixed after becoming