1d black (plate 7). Wrapper with Alford/140 mileage strike. Rockoff and Jackson, Volume 2 p250 note that Alford was a sub office of Spilsby. Inside is a date for April 24th and the item was received in Folkingham on Sunday April 25 1841. April 24th 1841 is later than the latest example on a 1d black cover listed by Rockoff and Jackson. This example from Alford is the only one with a mileage mark - the other example has a udc. The population of Spilsby in 1841 was only 1457.
