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12''', Dm= 27.2mm, Do= 27.6mm
f = 18000 A/h
Balance staff U2060
Mainspring / battery
Zf1211, 1.50 x 9.0 x 0.10 x 290mm
1.40 x 0.90 x 0.22mm
Comments about the data
first automatic family from Langendorf
differences not known between 1233N, 1261N
Strange design of winding mechanism (Fig.4, 5):
The crown wheel is not directly coupled to the ratchet wheel, but over a rocker cutch A with two wheels to a separate pinion on the pawl wheel B of the automatic gear. This inreases the efficiency of self-winding, because no parts of the manual winding gear are moved, but the high gear ratio between crown wheel and ratchet wheel makes manual winding rather slow - more an "emergency winding" to start the watch.
Attention: Differing from most automatics, this one has no click for the ratchet wheel. The click C (Fig.5) ist the only to disable the maimspring from unwinding. So before removing the automatic bridge, the spring must be unwound. There is a hole above the ratchet wheel screw, allowing to control unwinding with a screw driver, if the stem is not mounted.
Saving height (Fig.6):
With an intermediate wheel A between central minute pinion B and a separate minute wheel C, this minute wheel no longer overlaps the barrel. The result is a lower profile without reducing sturdiness or accuracy, and actually this movement belongs to the thinnest automatics of the 50s.
1233, 1261: 12'''
1235, 1262: 12''', date
suffix N: automatic modified
Example, year: signature; shock device
ca. 1955: Lanco-Rotor, 1233, Swiss Made, 21 Jewels - LWC; 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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