ST 1854 A - Large date: The 5 has a slightly curved top bar and ends in a point.
The 4 has a T-bar tail. The 54 is just lower than the "18" baseline.
ST 1854 B - Large date: The 54 numerals are as per type "A" but they now appear to
be further below the "18" baseline.
ST 1854 C - Date: The 8 has been double struck and now tilts forwards (bit showing top left)
ST 1854 D - Date: The 18 have both been double struck. The 1 has a bit showing just below.
The 8 has a bit showing top left but appears more upright than on type "C".
ST 1854 E - Date: The 54 have both been double struck. The 5 has a bit showing just below.
The 4 also has a bit showing just below but it is very faint and hard to see.