The Complete Guide to
British Colonial
Three Halfpence
by
The Royal Mint struck for circulation 158,400 pieces using an unrecorded number of dies with only 8 varieties seen, consisting of 7 obverse dies paired with 4 reverse dies as follow:
US struck below M's baseline of GULIELMUS. With or w/o die crack from dentil through field between S of GULIELMUS and first I of IIII.
Smaller 6 aligned with 3's baseline. Double struck 1, bar, baseline & tail of 2 in fraction. With or w/o die cud in rim at 9 o'clock.
US struck below M's baseline of GULIELMUS. Double struck BR of BRITANNIAR. Defective D of F:D:. With or w/o die crack(s) from rim through field beetwen R & I of BRITANNIAR and from dentils to fourth I of IIII. 
Smaller 6 aligned with 3's baseline. Double struck 1, bar, baseline & tail of 2 in fraction. With or w/o die cud in rim at 9 o'clock.
US struck below M's baseline of GULIELMUS. Colon after D of D:G: slanting right. With or w/o die crack from first I of IIII to dentil.
Larger fraction bar over smaller bar. In date, smaller 1, larger 3 over smaller 3 and smaller 6 above 3's baseline.
Δ Plate coin's images courtesy of Galata Coins of Llanfyllin, Powys, U.K.
US struck aligned with M's baseline of GULIELMUS. With or w/o die crack(s) from dentil to M of GULIELMUS, from first A of BRITANNIAR, from dentil to King's hair at 12 o'clock and from dentil to King's truncation at 6 o'clock.
Smaller 6 aligned with 3's baseline. Double struck 1, bar, baseline & tail of 2 in fraction. With or w/o die cud in rim at 9 o'clock.
US struck aligned with M's baseline of GULIELMUS. With or w/o die crack from D of D:G: to dentil.
Smaller 6 aligned with 3's baseline. Double struck 1, bar, baseline & tail of 2 in fraction. With or w/o die cud in rim at 9 o'clock.
In GULIELMUS, G below U's baseline, US aligned with M's baseline. With or w/o die crack from dentil through X of REX.
Smaller 6 aligned with 3's baseline. Double struck 1, bar, baseline & tail of 2 in fraction. With or w/o die cud in rim at 9 o'clock.
In GULIELMUS, US aligned with M's baseline. With or w/o die crack(s) from dentil to King's hair at 12 o'clock and from dentil to R of REX.
Smaller 6 aligned with 3's baseline. Double struck 1, bar, baseline & tail of 2 in fraction. With or w/o die cud in rim at 9 o'clock
US struck aligned with M's baseline of GULIELMUS. With or w/o die crack from D of D:G: to dentil.
Larger fraction bar over smaller bar. In date, smaller 1, larger 3 over smaller 3 and larger 6 below 3's baseline.
