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Valentine and Sons was a printing company founded in Dundee, Scotland in 1851 by James Valentine (1815-1879), that grew to become Scotland's leading manufacturer of picture postcards.
Following James Valentine's death the company was run by his sons, William Dobson Valentine (1844-1907) and George Valentine (1852-1890).
The company was purchased by John Waddington Limited in 1963, who sold it in turn to Hallmark Cards in 1980. Dundee operations ceased in 1994.
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Source of article : Wikipedia