The narrow dates in 1874, 1875, 1876, 1877, & 1879 are different dies to the normal wide dates of the same years. The most noticable difference being the narrow dates have a thinner lighthouse Date spacing appears to be variable over most of the bun (and the veiled head) series, and in general is random with respect to dies You need to get hold of a copy Michael Gouby's book for details of known combinations. Date spacing is regarded as insignificant by most collectors, but it's quite good fun to try and get the range for each date even with cheap very worn examples. For example I have 4 different 1871s (they are all crap though) David