Designed so that the time could be determined by touch, Patek produced montre à tact watches from 1845 and introduced them to the public at the 1851 London Universal Exhibition. Patek Philippe produced a small number of watches with the 'tact' system from c. 1845 and examples were exhibited at the Universal Exhibition in 1851 (see: Patek Philippe Museum, Patek Philippe Watches, Vol. 1, p.70). The pointer affixed to the outside case back can be rotated in a clockwise direction by the user until it is halted by the watch's 'à tact' mechanism, a series of touch pins arranged at half hourly intervals around the bezel of the case back allow the time to be read. In the present watch, the addition of quarter repetition also allows a more precise determination of the time, still without the necessity of viewing the watch's dial.
The Arms are stated to probably be Vogl of Bavaria, ennobled on 4 May, 1763.
For another montre à tact by Patek, movement no. 51267, see Peter Friess, Patek Philippe Museum Emergence of the Portable Watch, Vol I, p. 70.
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