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Type 1		c1870 – 1884
Type 2a		1884 – 1893	Design A
Type 2b		1892 – 1901	Design A	No post between door end windows
Type 3a		1900 – 1906	Design A
Type 3b		1898 –	Design B
Type 4a		1906 – 1917	Design A	As Type 3 with horizontal lap boarding
Type 4b			Design B
Type 4c		1908 – 1915	Design C
Type 4d		1917 – 1928	Design A	No finials
Type 4e		1926 – 1930	Design C