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Westclox Big Ben Style 4a Loud Back Type Variations

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The first backs don't say MADE IN U.S.A., later ones do.

1 Has four patent dates and doesn't say MADE IN U.S.A. Used from the start to ca. July 1937.. Big 4a Back 1
Big 4a Back 1
1 Has four patent dates and doesn't say MADE IN U.S.A. Used from the start to ca. July 1937.. Big 4a Back 1
Big 4a Back 1

Back Type 1:

Has four patent dates and doesn't say MADE IN U.S.A. Used from the start to ca. July 1937.

PATENTED U.S.A.
1563431
1709146
1848520
85916


2 Has four patent dates and says MADE IN U.S.A. Used from ca. September 1937 to the end.. Big 4a Back 2
Big 4a Back 2
2 Has four patent dates and says MADE IN U.S.A. Used from ca. September 1937 to the end.. Big 4a Back 2
Big 4a Back 2

Back Type 2:

Has four patent dates and says MADE IN U.S.A. Used from ca. September 1937 to the end.

PATENTED U.S.A.
1563431
1709146
1848520
85916
MADE IN U.S.A.

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