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Using FHF 90-5 instead of ETA 2483 for Tudors?


hologramet

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I just found a dealer that had NOS FHF 90-5 and it seemed very similar, almost ridiculously similar to ETA.

And it still seems very-very similar. Am I missing something? Can these be used?

Wait... now I get it. Unitas FHF and AS became ETA.

View picture in original size
Fig. 1

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Fig. 2

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Fig. 3
 
FHF 905

Features
automatic
sweep second
date: quickset

Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 5.4mm
F= 1.45mm
T= 1.9mm
17/25 jewels
f = 21600 A/h
power reserve 43h

Balance staff U3440

Stem W3352

Mainspring / battery
1.20 x 10.0 x 0.105mm

Hands
1.50 x 0.90 x 0.25mm

Comments abo

 

Technical data: FHF 90-5

  • 17/25 jewels, Automatic wind, center second, date, quickset.
  • Size: 11.5'''  25.6 mm.
  • H: = 5.4 mm.
  • N: = 18.000 A/h.
  • Power reserve: 43 h.

Versions:

  • 90-4:     date.  
  • 90-5:     date.
  • 90-9:     day, date.
  • 905:      minor modifications, date.
  • 908:      minor modifications, day, date.
View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3
 
ETA 2451

Features
automatic
sweep second

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

-----

Accoring to the source, it's even 18k bph. So... the small small difference 0.1 mm here and there... Can they be used?

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  • 1 year later...
4 hours ago, walls-place said:

are the movements -905 and 2846 the same then?

 

I don't think so... but they have very similar size (the thickness is 5.2mm for the 2846 vs. 5.4mm for FHF 905... the other size are the same) Furthermore the 2846 is a day-date whereas the FHF 905 is date only (there are some 2846 variants without the day wheel)

My interest was to see where I could fit these movement (in which case)...

Edit:

the stem height is different... 1.9mm for FHF vs 2.25mm for ETA

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