The Shanghai 4131 movement, crafted by Shanghai and independently assembled by the Clean factory, boasts a remarkable 75-hour power reserve. This collaboration between Shanghai and Clean has elevated the 4131 to new heights in terms of quality and performance.

Previous issues found in the Shanghai 4130 movement, such as stability concerns, inaccurate chronograph functions, rough finishing, incorrect dimensions, winding feel, and rotor noise, have all been meticulously addressed in the 4131 version. The clean factory has secured exclusive rights to the Shanghai 4131 movement, ensuring a superior product.

Upon disassembly and comparison, the genuine 4131 and the SH 4131 exhibit matching appearance and dimensions, with only slight differences in certain shock stone details. The significant improvements in the 4131 demonstrate a quality leap from the Shanghai 4130.

Initial batches have already been released for internal testing, receiving positive feedback from early customers. While further market validation is needed, the Shanghai 4131 promises to deliver exceptional surprises to enthusiasts.

Though the initial engravings on the movement are from the first batch, the larger production run will feature engravings closely resembling the genuine article. The Shanghai 4131 movement showcases an impressive level of replication, closely aligning with the original.