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View picture in original size
Fig. 1

View picture in original size
Fig. 2

EB 8461-74

Features
manual wind
sweep second

Data
8.75''', Dm= 19.4mm, Do= 19.7mm
H= 4.15mm
F= 0.8mm
T= 1.5mm
1/17 jewel
f = 18000 A/h
power reserve 39h

Mainspring / battery
1.50 x 8.0 x 0.09mm

Hands
1.50 x 0.90 x 0.25mm

Comments about the data

Remarks
1974-
pin-lever escapement
indirect minute, hand friction clutch on barrel (Roskopf type, space for big balance)
releasing stem: strongly pulling the crown while turning it ccw
inserting stem: strongly depressing the crown while turning it ccw
There are several variants in this family. But they are poorly recorded, and therefore only known variants are listed here.
The movements are often or always signed with the designation of the mostly made variant. Therefore here codes for features are attached to this signature, if the official designation is not known.

family/generations:
layout for sub second:
8400: 10.5''', no second
8401: 10.5''', sub second
8404-8406: 10.5''', *
8410: 11.5''', no second
8411: 11.5''', sub second
8414-8416: 11.5''', *
8420: 8420: 12''', chronograph, date
8421-8425, 8428: 12''', *
8429: 8429: 13.5''', chronograph, date
8450: 8.75''', no second
8451: 8.75''', sub second
8454-8456: 8.75''', *
layout for sweep second:
8460: 8.75''', no second
8461: 8.75''', sweep second
8462-8467: 8.75''', *
8480: 10.5''', no second
8481, 8488: 10.5''', sweep second
8482-8487: 10.5''', *
8490: 11.5''', no second
8491: 11.5''', sweep second
8492-8497: 10.5''', *
suffix -73: new balance, since 1973
suffix -74: set lever held by spring instead screw, since 1974
*) mentioned in various parts catalgues, but without assigning to particular features

Example, year: signature; shock device
ca. 1980: Swiss, 17 Jewels; Novodiac

Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft


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