Lange began production in 1848 and promised 500 pieces per year. He underestimated the challenges that would come with training several apprentices, and consequently production was much slower than intended. The firm built only 17 pieces in 1848, 92 in 1849, 135 pieces in 1850, and 186 pieces in 1851.
For images and descriptions of various incarnations of early Adolf Lange key-wound watches, see op.cit., pp. 40-47, pls. 83-111.
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