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 Fig. 1  Fig. 2 | BM 12820 (Buren 1282) Features automatic date: set by changing 23-24h since ca. 1966/67 changing 22-24h Data 12.5''', Dm= 28.15mm, Do= 28.55mm H= 3.25mm F= 1.6mm T= 1.8mm 30 jewels f = 19800 A/h power reserve 54h Balance staff U3085 Stem W3060 Mainspring / battery 1.0 x 9.5 x 0.10mm Hands 1.40 x 0.80mm Comments about the data | Remarks 1962- micro rotor, double jewel bearing double excenter regulator for curb pins and stud carrier selfwinding gear with direction switching by a pinion floating between two huge jewels (Fig.2) indirectly driven minute allows a low profile (details cf. Buren 1320) since 1966/67 minor modifications of base plate and simplified date driver (cf. Buren 1322) family: 12800: only hour, minute 12810: date for flat dial 12820: date for domed dial 13200: second 13210: second, date for flat dial 13220: second, date for domed dial The assignment of flat/domed dial is based on few investigated Buren watches. Possibly Buren didn't sign carefully, since the Flume K3 mentions it vice versa. Example, year: signature; shock device ca.1965: Baume & Mercier, Swiss, 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. |
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