Hugh C. Leighton Co., Valentine & Son., and Leighton & Valentine Co.

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Hugh C. Leighton was formed in Portland, Maine in 1905.

Merged with Valentine & Sons (New York, 1907) in 1909 to form Leighton & Valentine Co.

Leighton & Valentine Co. purchased Souvenir Post Card Co. (New York, 1905) in 1914 to form Valentine & Souvenir Co.