Sul forum italiano Orologi e Passioni, un amico ha presentato questo cronografo mono-pulsante Univeral Watch, con pulsante al 2, con calibro 14 ½, “’, numero seiale 500.XXX, che ha la particolarità, più unica che rara, di poter cronometrare i 30 secondi con una risoluzione al 1/10° di secondo. Lo avevate mai visto ? On the Italian forum Orologi e Passioni, a friend has presented this Univeral Watch mono-pusher chronograph, with a push-button at 2 o'clock, with calibre 14 ½, "', serial number 500.XXX, which has the peculiarity, more unique than rare, of being able to time the 30 seconds with a resolution of 1/10th of a second. Have you ever seen it? https://orologi.forumfree.it/?t=78814015 E' interessante osservare come per raggiungere le 36.000 Alt/h, il bilanciere sia stato notevolmente ridotto nel suo diametro, rispetto a quello di un movimento con 18.000 Alt/h; inoltre, anche la ruota folle della bascula di rinvio è stata sostituita da una doppia ruota coassiale. It is interesting to note that, in order to achieve 36,000 bph, the diameter of the balance wheel has been considerably reduced compared to that of a movement with 18,000 bph; in addition, the idler wheel of the return pulley has also been replaced by a double coaxial wheel.
This is highly interesting, thank you very much for sharing with us and I look forward to to hearing more about it from the local knowledgeable members. I'm not entirely clear on the concept of the double coaxial wheel here, so I would be grateful if someone would elaborate. [edit: now I got it]
Given the 15 minute counter at 3 o’clock, and the resolution down to 1/10th of a second, reminds me of navigator’s stopwatches like the “jitterbug” (144,000 beats per hour)