10BA

Start Year: 
1943
End Year: 
1947
Jewels: 
17
Reverend Rob's picture
Reverend Rob
Posted April 19, 2016 - 12:06pm

Panel Member
 

From the ETA 900 ebauche, modified balance. Other variations in the family included different bridge shapes and either Breguet or Flat Hairspring.

Features:

Manual wind, sub second

7/15/17 jewels

Data:

10.5'''

Dm= 23.35 mm, H= 3.5mm, F= 1.3mm, T= 1.7mm

18,000 a/H Frequency

41 hour Power Reserve

Mainspring: 1.55 x 9.0 x .10 x 290mm

Hands: 1.40, .80, .22

Specs courtesy Dr. Ranfft

     
rtwatches
Posted April 16, 2016 - 12:16pm

I have a 15j 10BA with a 1944 date code.