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Westclox Big Ben Style 3 Back Type Variations

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Big Ben Style 3 backs had three different groups of patent numbers. The first backs have a slide alarm on/off switch, later ones have a pull switch.

1 Two patent numbers and a sliding alarm on/off switch. Used from the start of Style 3 (1931) to ca. late 1931.. Big 3 Back 1 — Big 3 Back 1

1 Two patent numbers and a sliding alarm on/off switch. Used from the start of Style 3 (1931) to ca. late 1931.. Big 3 Back 1 — Big 3 Back 1

2 Three patent numbers and Canada Rd. 1931 and a sliding alarm on/off switch. Used from ca. late 1931 to late 1932.. Big 3 Back 2 — Big 3 Back 2

2 Three patent numbers and Canada Rd. 1931 and a sliding alarm on/off switch. Used from ca. late 1931 to late 1932.. Big 3 Back 2 — Big 3 Back 2

3 Three patent numbers and Canada Rd. 1931 and a pull alarm on/off switch. (Same as type 2 but has pull alarm switch). Used ca. early 1933 through early 1934.. Big 3 Back 3 — Big 3 Back 3

3 Three patent numbers and Canada Rd. 1931 and a pull alarm on/off switch. (Same as type 2 but has pull alarm switch). Used ca. early 1933 through early 1934.. Big 3 Back 3 — Big 3 Back 3

4 Five patent numbers and Canada 1932 and RD. 1931 and pull alarm switch. Used ca. mid-1933 to end of Style 3.. Big 3 Back 4 — Big 3 Back 4

4 Five patent numbers and Canada 1932 and RD. 1931 and pull alarm switch. Used ca. mid-1933 to end of Style 3.. Big 3 Back 4 — Big 3 Back 4

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