Esta es mi apuesta
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Gents Mido Multifort Superautomatic Powerwind, Incastar, 1956[/SIZE]
D=31mm
Movement: Mido Limited, Swiss, calibre
Mido 0917P, 17 jewels, monometallic screw balance, Incabloc, Incastar regulator
[SIZE=+1]
Mido 917P[/SIZE]
Features
automatic
sweep second
Data
12''', Dm= 27.3mm, Do= 28.0mm
H= 5.5mm
F= 0.8mm
T= 1.6mm
17 jewels
f = 18000 A/h
power reserve 41h
Balance staff U1698
Stem W2058
Mainspring / battery
Zf931, 1.35 x 8.0 x 0.09 x 250mm
Hands
1.30 x 0.84 x 0.21mm
Remarks
1952-1960
option: black rhodium plating (charcoal, slight mauve)
option Incastar regulator:
The only large-scale produced regulator featuring a free oscillating hairspring. The end of the spring is fixed between two rollers, adjusting actually its length (Fi. 4, 5)). No isochronism error by the gap between the regulator pins.
family/generations:
10.5''':
00916P: rotor, sub second
00917P: rotor, sweep second
11'':
0915: manual wind, sweep second
0916: bumper, sub second
0916P: rotor, sub second
0917: bumper, sweep second
0917P: rotor, sweep second
0917PC: rotor, sweep second, date
12''':
916P: rotor, sub second
917P: rotor, sweep second
917PO: same, especially for Ocean Star
917R: same, extra quality
917PC: rotor, sweep second, date
917PCO: same, especially for Ocean Star
917RC: same, extra quality
12.5''':
916: bumper, sub second
917: bumper, sweep second