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Old 18 March 2017, 11:13 AM   #1
42mm Scud Missile
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Co-Axial In house?

Sorry if this is a silly question but is the Co-Axial movement fully in house?
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Old 18 March 2017, 11:28 AM   #2
Bushido
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Under any reasonable definition of the term "in house" I would confidently answer yes.
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Old 18 March 2017, 06:06 PM   #3
GMT Fan 23
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My most trusted watch expert at my reputable AD says yes
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Old 18 March 2017, 07:11 PM   #4
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The earlier ones are modified ETA movements. Cal 2500 is basically a 2892 with a different escapement.

The new 8500, 9300, etc were developed with a lot of help from ETA, don't know if it's a true in-house but doesn't really matter IMO.
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Old 23 March 2017, 03:36 AM   #5
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You also have different versions in the Cal 2500. 2500c and 2500d
Where the 2500c has a two level escape wheel and the 2500d is said to have a three level co-axial escapement as in the cal 8500. Which separates the function of the small escape wheel and the escape pinion into two dedicated components.
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Old 23 March 2017, 03:38 AM   #6
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Cal 2500

You have 2 versions of the Cal 2500.
The 2500c has a two level escape wheel (also called the 'extra flat co-axial escapement' by George Daniels).
The 2500d is said to have a three level co-axial escapement, as in the cal 8500, which separates the function of the small escape wheel and the escape pinion into two dedicated components.
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Old 23 March 2017, 03:39 AM   #7
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Quote:
Originally Posted by SearChart View Post
The earlier ones are modified ETA movements. Cal 2500 is basically a 2892 with a different escapement.

The new 8500, 9300, etc were developed with a lot of help from ETA, don't know if it's a true in-house but doesn't really matter IMO.
You have 2 versions of the Cal 2500.
The 2500c has a two level escape wheel (also called the 'extra flat co-axial escapement' by George Daniels).
The 2500d is said to have a three level co-axial escapement, as in the cal 8500, which separates the function of the small escape wheel and the escape pinion into two dedicated components.
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