Buying 100 mouvements 7750...?

No but google translation gave me the impression.
I am currently not sure if they are real Baljouxbor chi

No I did not contact him, my french is not up to the task.🙁

You missed the OF limited Edition from swatch many years ago........
Many older members still have theirs 😉

Thanks for clarifying.
You can get Chinese clones for this amount or less.
Case, dial, hands are plenty at ofrei.
Internal bezel I have not immediately seen.
My guess is that as an individual you can make your own chrono for $400-500 and as 5-10 group maybe below $400. This is of course with a Chinese clone. Add $400 for a Swiss movement.

For that price, I would want to be sure they are really ETA movements and not copies. Also, for those thinking this is just a slap together job to create your own brand, these are sold in the bulk style packaging, rather than in the individual sealed foil packs with inert gas. You would need to know how long ago these were produced, because unlike the movements that are in the sealed foil packages, these won't be dated, so could have been sitting on a shelf for years...even decades. The plastic containers these are in are not really sealed all that well, and dust can get inside.

There is a real chance all these already need servicing, and in fact when I use movements packed this way, I always service the movement before putting it into a watch. Some are in decent shape, but in others I've found bad oiling, pivots missed so not oiled at all, broken jewels, etc.

Cheers, Al