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New Asian copy of the ETA 7750 |
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Articles -
Watchmasters Corner
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Written by Ziggy Zumba
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Page 1 of 7
Ziggy tears down another new movement from the Chinese: a copy of the venerable ETA 7750. While this has been copied before (with only moderate success) this new movement may be a different animal. The 7750 is used in a variety of Breitling replicas, as well as in the new replica Rolex Daytona.
Introduction
Well this has been an exciting and interesting week at the workbench. First we have the “Chinese” copy ETA 6497-2 model arrive, and now this, an Asian 7750 (not a B or B1 or whatever, I have seen many of these so called improved 7750’s but they all looked the same). This one however is vastly different from the rest, not only in fit/finish/cleanliness etc, but in the most important area for the purists, it’s a 28,800 BPH movement (8 ticks per second, identical to an ETA).
So here is an overall view of this model, both from the dial and case back sides.
Note that this particular one is from a Daytona with running seconds at 6, and if you remember my comments and review of this particular layout on a 7750 when the ETA powered one came out last year, I stated it was asking too much of the movement. In other words, adding 11 new gears to move all the sub-dials over the face, is not a good idea and is prone to problems. Given the number of ETA powered Daytona’s that have crossed my bench, and my failure to correct the problems with them (as long as you don’t consider freezing sub-dials is “correcting” the problem), I don’t see how this layout will work any better given the Asian power verses the Swiss powered models. I was not to be disappointed in my findings…
So lets have a look at this movement in detail and see what it has in store for us. First of all, the finish is far superior to the previous models (7750B, 7750B1 etc), I am not sure what to call this one, but it’s not in the same league as the predecessors, not even close.
Teardown revealed a clean movement, and very well made parts and pieces, but not a drop of oil except for in the balance cap jewels (why will be revealed, it’s not what you think, I believe not oiling the movement was a deliberate move). There is no comparison to the other Asian 7750’s I have worked on, this is totally different and vastly superior.
Details and pictures
Here are some various detailed pictures of the parts and pieces, I did not find any dirt or metal pieces in the movement. It was very clean.
Balance and escape
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Last Updated ( Tuesday, 14 August 2007 )
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