Rare plate used by watchmakers working in the carriage-clock trade, 19th century.
Brass plate scribed both sides and drilled for what appears to be a cylinder escapement platform. 42.5 x 34.5 mm.
Plates like these were used to record various different sizes and designs of rough escapement platforms that could be ordered from the manufacturers prior to being finished. Rough watch movement caliper plates very rarely survive, but this is the only example of its type I have seen. French or English in origin.
A rare an important aspect of our horological past. In typically handled condition, but still clearly showing the markings.
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