Were used up to 1963. These are mechanical like a watch. Very fragile and beautiful. The needle often goes up in small shocks and leaps and it will not pop back to zero when you park the bike.... This is normal!!! Many Chronometrics have been "repaired" to death by hamfisted mechanics. So a good or repairable one is rare and expensive.
At the moment I am moving the shop to a new location. I'll be in the shop on thursday and friday only.
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