What Is This Mysterious Movement? Really In-House?
Hoping some of my fellow watch nerds can help me. I'm reviewing an automatic Stuhrling watch. They claim this is an 'in-house' movement, but it looks just like loads of the generic skeleton watches on AliExpress. I'm trying to identify if this is actually an off-the-shelf movement.
@OldSnafu pointed out in my previous post that it looks very similar to the mechanical Chinese 2660S, only with a rotor attached. Perhaps it's this 2650-SSZ or some variant of the Chinese standard movement with minor changes?
Does anyone know exactly what this might be? I anticipate something cheap as the noise coming from both the ticking and the rotor itself are ridiculously loud. It also looks much cheaper in person, the brushing is rougher than my lighting setup would indicate.
Any help would be greatly appreciated, as I don't want to give out false information. Thanks 👍
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I would err on the side of caution. The heritage is pretty clear, but even a small customization could make it a proprietary movement. And no, I couldn't find any detail on the movement anywhere.
that was a good read !
It looks identical to that 2650-SSZ you linked to (but with blue screws on the back side).
It looks like a Chinese take on the 2824.
could it be this one?
https://calibercorner.com/stuhrling-caliber-st-90050/
To me "in-house" entails some sort of original design made in-house or a significant design change to a base model (e.g. Powermatic 80). This looks like it uses a Chinese base model for sure and assuming they didnt make a signifcant design change like change the frequency, power reserve, etc. I would say its marketing more than reality. Changing the rotor or even the exterior finish does not qualify as an in-house movement in my eyes.
I don't know if this will help, but it might.
https://www.watchuseek.com/threads/pts-resources-2650-caliber-standard-movements.336614/
and:
https://www.watchuseek.com/threads/stuhrling-original-st-90050-movement-id.336615/#post-2497733
I just came across this movement in a non-skeletonized version.
It does look like a standard handwound movement that had an automatic train added to an existing design. The implementation of the "magic levers" is particularly awkward, omitting a secondary wheel to drive the levers, but mounting the levers directly on the rotor's pinion with a offset pin, which is not nearly as effective and somewhat fragile. (In contrast to the rest of the movement, which seems rather robust )
It came in a $25 watch, and I ended up practicing on it.