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Westclox Big Ben Style 1a Back Type Variations

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Style 1a Big Ben clocks have a series of patent sequences on the back. The patents were in two different locations. Later backs have patent numbers instead of dates.

1914.1 1902 through 1914 patents in list at top right. (The patent list was moved for the style 1a clocks because hole for inner back screw was in the way, otherwise this back would have been the same as the final style 1 back.) Used from the beginning of Style 1a production until ca. March 1920.. Back 1914.1 — Back 1914.1

1919.1 1902 through 1919 patents in list at top right. Ca. March 1920 until around the end of 1922.. Back 1919.1 — Back 1919.1

1919.2 1908 - 1919 patents in list at top right. Used from around the beginning of 1923 until around mid-1925.. Back 1919.2 — Back 1919.2

1919.3 1908 through 1919 patents in list at lower left. Used from around mid-1925 to early 1926.. Back 1919.3 — Back 1919.3

1925.1 1910 through 1925 patents in list at lower left. Used from early 1926 to ca. late 1927.. Back 1925.1 — Back 1925.1

Num.1 Patent numbers 958,930 through 1,563,431 in list at lower left. Ca. late 1927 to around 1931 -1933 (more data needed).. Back Num.1 — Back Num.1

Num.2 Patent numbers 1,563,431 through 1,848,520 in list at lower left. Used from around 1933 (more data needed) until the end of Style 1a production in 1935.. Back Num.2 — Back Num.2

1970 Repro Used on the 1970 Big Ben style 1a reproduction. Patents 1908 - 1910 at upper right.. Back 1970 Repro — Back 1970 Repro

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