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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

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Fig. 5

Buren 1320

sweep second

12.5''', Dm= 28.15mm, Do= 28.5mm
H= 2.85mm
(rotor +0.35mm)
F= 1.1mm
T= 1.4mm
17/21/30 jewels
f = 19800 A/h
power reserve 54h

Balance staff U3085

Stem W3060

Mainspring / battery
1.0 x 9.5 x 0.10mm

1.40 x 0.80 x 0.18mm

Comments about the data

micro rotor, double jewel bearing if 21 or 30 jewels
double excenter regulator for curb pins and stud carrier
selfwinding gear with direction switching by a pinion floating between two huge jewels (Fig.5)
indirectly driven minute and second allow a low profile
Details in Fig.4: The coupling between excentric cannon pinion A and free-running center pinion B is made free from play by pressing the hour wheel C against both. For this purpose the hour wheel usually runs in an oval hole and is pressed by a spring. Here the spring is integrated into wheel C. This means a precise bearing and requires less heigth.
since 1966/67 minor modifications of base plate (cf. Buren 1322)

1280: only hour, minute
1281: date for flat dial
1282: date for domed dial
1320: second
1321: second, date for flat dial
1322: second, date for domed dial
The assignment of flat/domed dial is based on few investigated watches. Possibly Buren didn't sign carefully, since the Flume K3 mentions it vice versa.

Example, year: signature; shock device
ca. 1965: Dugena, 1320, Swiss Made, 30 Jewels; Incabloc

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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