Remarks
Pin anchor inhibition
Indirect minute, pointer movement on spring house (Roskopf type)
Only signed with 866
Family:
866: Central second
866 (CLD): Central second, date
866 (CLDD): Central second, day, date
866 (digital): Central seconds, digital display
866 (digital, CLD): Central seconds, digital display, date
875: small second
Example, year: signature; Shockproof
Ca. 1970: BFG 866, GP, Swiss Made, 17 Jewels
(13.5 '' ')