The Shanghai 4131 movement, a joint effort between Shanghai and Clean, represents a significant leap in quality and performance compared to its predecessor, the Shanghai 4130. This new movement boasts a powerful 75-hour power reserve, with refined craftsmanship, plating, engraving, and assembly exclusively handled by Clean. Such advancements address the numerous issues previously encountered with the 4130, including stability problems, imprecise chronograph reset, coarse finishing, incorrect dimensions, poor winding feel, and excessive automatic rotor noise. All these concerns have been meticulously improved in the 4131.

While the Shanghai 4131 and the genuine 4131 appear identical in terms of appearance and size upon disassembly, minor disparities are noted in specific shock-absorbing components. It is crucial to emphasize that the Shanghai 4131 is on a different quality level compared to the older 4130 movement. Early samples have already been released for internal testing, and customer feedback has been overwhelmingly positive. However, further market validation is necessary, and patience is requested as this movement promises to deliver unexpected surprises post-verification.

The initial versions of the Shanghai 4131 feature engraved markings that resemble the genuine article, with mass-produced units set to achieve even closer resemblance. Overall, the replication fidelity is remarkably high, underscoring the meticulous efforts invested in engineering a movement that not only matches but exceeds expectations.