A well-known set from Sweden, is the 'crown and posthorn' series.
On first sight, there are 14 different stamps in this set, going from 35 öre to 145 öre.
But if you have a closer look, there is much more to be discovered.
35 öre yellow
The 35 öre yellow, was issued in 1922 and reprinted in 1925.
The second printing was slightly different then the first printing, so that makes the stamp devide into two types.
|Type 1 - issued in 1922, cancelled in 1925|
in type 2, this line is straightened.
|detail 1, curvy line in 'öre'|
Next to the 'T' in the word 'POST', the grid of the background is incomplete, resulting in a white spot, next to the 'T". This was corrected in the 1925 version.
|detail 2, white spot next to T upper right corner|
|Type 2, issued in 1925|
|detail 1, straightened line in the 'R'|
|detail 2, no white spot in the grid next to the 'T'|