An extremely rare watch key with integrated foldable miniature opera glass Case: gilt and granulated brass case set with blue stones. Central lens, surrounded by mother-of-pearl with gleaming polished steel flowerets.
Illustrated and described in: "The Keys of Time" by Yves Droz, France 2012, p. 104-105.
Estimate 3,200 - 4,500 €
Price Realised 4,300 €
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