ST 1861 Ah - The lower colon dots after F: D: are either very weak or non existent.
ST 1862 Ak - The colon dot closest to the edge after F is missing - leaving just a full stop. The lower colon dot, furthest from the edge, after D is missing.
The colon dot closest to the edge after D & G are both missing !
ST 1863 Am - The foot of the F is missing. Part of the top and bottom of the D is missing.
ST 1863 An - The bottom colon after D is in contact with the D.