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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Durowe 7528/1 (INT)

Features
automatic
sweep second
date: quickset
month calendar: manual quickset for days of the week in a month-overview

Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 5.9mm
F= 1.9mm
T= 2.7mm
21/25 jewels
f = 21600 A/h
power reserve 38h

Balance staff U3224

Stem W3278

Mainspring / battery
1.30 x 9.5 x 0.105mm

Hands
1.50 x 0.90 x 0.21mm

Comments about the data

Remarks
signature due to small quantities mostly or always 7526/1

family/generations:
10.5''' manual wind:
7410: -
7411: 24h hand
7412: date
11.5''' manual/automatic respectively:
7420/7520: -
7421/7521: 24h hand
7422/7522: date
7423/7523: day, date
7424/7524: minute stop feature
7425/7525: date quickset
7426/7526: day, date quickset
7427/7527: day at 9h, date quickset
7428/7528: date, month calendar, quickset
7430...7438 like 7420...7428, but jumping second
7530...7538 like 7520...7528, but jumping second
suffix /1: modification quickset date
suffix /2: minor modifications
suffix /3: modification click spring

Example, year: signature; shock device
ca. 1972: Durowe/INT 7526, Duromat, 21600, 25 Jewels; Duro-Swing
(Durowe 7528)

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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