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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Ronda 1223-21

Features
manual-wind alarm
sweep second

Data
12''', Dm= 26.6mm, Do= 27.0mm
H= 5.65mm
F= 2.65mm
T= 3.55mm
1/17 jewels
f = 21600 A/h
power-reserve 38h
alarm 10s

Balance staff U3254

Stem
watch: W3215
alarm: W3406(long), W3414(short)

Mainspring / battery
Zf1051, 1.40 x 9.5 x 0.105 x 300mm
(watch)

Hands
2.50 x 1.80 x 1.30 x 0.20mm

Comments about the data

Remarks
1972-
pin-lever escapement
in late samples glued hairspring terminal (cf. Ronda 1233-21)
stem mechanism without setting-lever spring
strange: train and hand gear separately driven by the barrel (cf. Ronda 9011)

family/generations:
pin lever / Swiss lever:
1x11/1x31: manual, no second
1x13/1x33: manual, sweep second
1x15/1x35: manual, sweep second, date
1x16/1x36: auto, sweep second
1x17/1x37: manual, sweep second, day, date
1x18/1x38: auto, sweep second, date
1x19/1x39: auto, sweep second, day, date
1x21/1x41: manual, sweep second, digital display
1x23/1x43: manual, sweep second, alarm
1x26/1x46: auto, sweep second, digital display
1x66/1x86: auto, digital display incl. second
x=0: 10.5'''
x=1: 11.5'''
x=2: 12'''
x=3: 13.5'''
suffix -21: 21600A/h
Swiss-lever movements normally have the singature RAX under the balance, but some also RL like the pin levers.
Not all variants were actually made. Only those are listed, which are actually known or contained in current registers.

Operating instruction
Crown at 2h: Usual function for setting and winding.
Crown at 4h: Turn right to wind the alarm barrel, turn left to set the alarm time. When pulled, the crown is disengaged to prevent changing the alarm time by accident.

Example, year: signature; shock device
ca. 1975: RL, 1223-21, E. Gunzinger Co, Swiss, 17 Jewels; Kif-Protechoc

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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