Jaquet DSE 1210.35 SHZ SIL speed sensor - Istec Webshop
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JAQUET Green Line Speed Sensors|sensor card|speed sensor kiasensor case - AliExpress
Attributed to Jaquet Droz et Leschot. An extremely fine and possibly unique 18K gold, enamel and pearl-set centre seconds urn-form cylinder watch made for the Chinese market, enamel in the manner of