Farthings

Charles II:
Copper: 1672-1679
Tin: 1684-1685 (1685 is excessively rare)

James II (tin, date on rim):
First Obverse, 1684-1687
Second Obverse, 1687

William and Mary:
Tin: 1689-1692 date on rim and on exergue. In some cases, they don't match!
Copper: 1694

William III (copper):
Date in exergue: 1695-1700
Date in legend: 1698-1699

Anne: 1713-4 (copper)

George I:
Dump issue (copper): 1717-8 (1718 believed unique; not mentioned in Peck but is noted in Spink)
Dump issue (silver, thin flan, proof): 1718
Larger diameter (copper): 1719-24

George II (copper):
Young head: 1730-7, 1739
Mature head ("GEORGIUS"): 1741, 1744
Mature head ("GEORGIVS"); 1746, 1749, 1750, 1754

George III (copper) - for such a long reign, there are very few circulation dates to be had:
1771-1775 (younger effigy)
1799 (steam power pressings begin, older portrait)
1806-1807 (older portrait, SOHO, shorter hair)

George IV: 1821 - 1826 (first effigy); 1826-1830 (second effigy) - all copper

William IV (or IIII): 1831-1837 (copper)

Victoria:
1838-1860 (Young head, copper, two distinct portraits with the second a bit more aged)
1860 (Bun head, beaded border)
1860-1894 (Bun head, bronze, several obverse portraits aged over time; 1860 had BB/BB, TB/BB and TB/TB)
1895-1897 (Veiled head, bronze)
1897-1901 (Veiled head, bronze, darkened by the mint)

Edward VII: 1902-1910 (bronze, darkened by the mint)

George V:
1911-1918 (first effigy, bronze, darkened by the mint)
1918-1926 (first effigy, bronze)
1927-1936 (second effigy, bronze)

George VI:
1937-1948 (bronze)
1949-1952 (bronze, IND:IMP omitted)

Elizabeth II
1953 (bronze)
1954-1956 (bronze, BRITT:OMN omitted)