L.-P. Demay was sponsored as master by Louis Lenhendrick in 1758, when he was living on the pont Notre-Dame in Paris. In 1769 he sponsored his son, Jacques-Joseph Demay, as master. In the same year a watch-case was seized from L.-P. Demay by the wardens of the guild as being below standard, but it was subsequently returned to him. His shop on the p...
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