This product is a balance bridge and wheel complete balance assembly for the Zenith El Primero PHC 3019/400 watch. It is compatible with the New Balance brand and is specifically designed for the Zenith El Primero model. The product is made by Zenith, a well-known brand in the watch industry.

You will need to work with the watchmaker to evaluate what you need to get this in a watch and confirm that it is OK. It was last running in the watch it was in.