Cal.0617P. 18000 BpH. Ca.1956. "Smallest calibre with center sweep-second"
The diameter is 19 mm including crown.
Very small.
Very powerfull engine.
Very stable.
Very accurate (not more than +20 sec. per week, worn)
Very powerfull engine.
Very stable.
Very accurate (not more than +20 sec. per week, worn)
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