Аccording RANFFT WATCHES - Pink Pages for Timepieces
Data Raketa 2609 Features
manual wind
sweep second
Data
11.5''', Dm= 26.0mm, Do= 26.6mm
H= 4.6mm
F= 1.1mm
T= 2.4mm
17 jewels
f = 18000 A/h
power reserve 39h
Balance staff U3365
Stem W2988
Hands 1.60 x 1.00 x 0.19mm
Comments about the data
Remarks Breguet hairspring Raketa combined settings for escape wheel late samples with ring balance There are some detail differences within the family which can't be assigned to particular variants, e.g. long or short regulator hand, 1 or 2 crown-wheel screws, 8 or 16 balance screws, with or without recesses for casing screws, Incabloc or Poljot shock devices.
family/generations:
lever cock: 2609: 16 jewels
2609A, 2609A.1, 2609B: 21 jewels
lever bridge: 2609.1: 17 jewels
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