Dugena 1026

Automatic · 11.5‴ · Switzerland · 1965

Also known as: AS 1739, Helvetia 846

Dimensions
26 mm
Height
4.60mm
Jewels
25
Power reserve
36h
Timegrapher
Beat rate
18,000bph
Frequency
2.5Hz

Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.

Movement
Movement type Automatic
Winding type Automatic (Rotor-Driven)
Setting type Stem Set (Crown Pull)
Escapement type Swiss Lever
Control type Balance Wheel
Regulator type Pinned Regulator (or Index Regulator)
Rotor type Central Rotor
Shock protection Incabloc
Specifications
Lignes 11.5‴
Shape Round
Complications Sweep Second
Hand count 3
Hand sizes 1.50 x 0.90 x 0.20mm
Further measures
Mounting Diameter (Dm): 25.6mm
Ball Bearing: 0.05mm
Stem height (T): 2.0mm
Mounting Height (F): 1.3mm
Origin & References
Manufacturer Dugena
Base caliber AS 1739
Country Switzerland
Launch year 1965
COSC certified No
Signature
ca. 1965: Helvetia, Swiss Made, 25 Jewels; Incabloc (Helvetia 846, AS 1739)
US import codes
Notes
Remarks: rotor placed out of center
The winding gear is integrated in the movement, instead of attaching it to a manual-wind calibre as usual. This led to a sensationally thin movement at that time.
detached manual wind
escapement from Helvetia
Kif-Duofix combined settings for escape wheel
Other data: balance staff: U2981 stem: W2973 mainspring / battery: 1.20 x 9.0 x 0.10mm
Family

Series 1026 - 1027

1026: -
1027: date
Related calibers
Dugena 1026 Dugena 1027