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manual-wind chronograph, 60s, 30/45min, cam switched
13.75''', Dm= 31.0mm, Do= 31.5mm
f = 18000 A/h
power reserve 41h
Balance staff U1457
Mainspring / battery
Zf978, 1.35 x 12.0 x 0.14 x 360mm
1.85 x 1.30 x 0.25 / 0.27 x 0.22mm
Comments about the data
option: 3 pushers (reset with crown pusher)
first chronograph with cam switching
just shortly produced predecessor of the Landeron-48 family
From the Landeron 47 to the 48 there was a floating transition. Many parts were modified, but except the minute-recorder jumper all are interchangable. Samples with all features of the Landeron 47 (like the examples) are pretty rare, and therefore can be dated to the first production year.
*) Squint-eyed chronograph (Fig.3):
The axles of sub dials (white) and stem (red) are not aligned on one line, and chronographs with this calibre look anyhow squint-eyed. Moreover the sub dials have differing distances to the center-hand axle. But this is less noticable if the sub dials have different sizes.
Both has no technical reasons; it is just botch design. Already the early pillar-wheel calibres Landeron 11 and 13 got these oddities, and they remained, over the first cam-switching calibre Landeron 47/48, down to the very last generation of the family.
Example, year: signature; shock device
1-3) 1937: - Brevet+
3-4) 1937: - Brevet+ (3 pushers)
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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