hola Jfidelc, con la identificación hecha por P.G. y el enlace de VICENTE RAMIREZ a un hilo propio, ya queda todo dicho sobre la marca y el calibre, pero te invito a que tu mismo con una lupa localices su manufactura leyendo debajo de la marca roja.
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Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
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ETA 2452[/SIZE]
Features
automatic
sweep second
date: set by changing 21-24h
Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 5.3mm
F= 1.4mm
T= 1.85mm
17/21/25/30 jewels
f = 18000 A/h
power reserve 42h
Balance staff U2226 / U3136
for balance with/without screws
Stem W2426, W3226
Mainspring / battery
Zf869, 1.30 x 9.5 x 0.105 x 300mm
Hands
1.50 x 0.90 x 0.21mm
Comments about the data[/TD]
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Remarks
early fixed (Fig.1), later mobile stud carrier (Fig.4)
during manufacturing periode modifications of base plate and rotor (cf. photos)
base calibre for the Tudor 2484
differences not known between 2452, 2455, 2457, 2460, 2462, 2463
family/generations:
2390: manual wind, 10.5'''
2391: manual wind
2406: manual wind, date
2408: manual, new date mechanism
2450: automatic, 10.5'''
2451: automatic
2452: automatic, date
2453: like 2451, but single-material rotor
2454: like 2452, but single-material rotor
2456: automatic, date, 10.5'''
2471: automatic, prepared for new date
2472: automatic, new date mechanism
Example, year: signature; shock device
1-3) ca. 1955: Watex, Swiss Made, 25 Jewels - Patented; Incabloc
4-6) ca. 1965: Revue, Swiss, 21 Jewels - UT, Patented; Incabloc[/TD]
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https://17jewels.info/movements/e/eta/eta-2452/