HEUER 7711 caliber belongs to the 77XX family, probably developped in the 50’s. It has the split-second function and is in the most of “rattrapante” and “center minute” stopwatches since it was manufactured.
The video below shows the “rattrapante” wheel in action on a ref. 513.202 stopwatch. When the “rattrapante” wheels is locked the “rattrapante” second hand stops following the second hand.
technical general informations on the 7711 :
- 7 jewels
- unbreakable mainspring
- shock protected
advanced technical specifications (also see : ranfft.fr)
- frequence : 18000 A/h
- power reserve : 20h
- dimension : 19 lignes