Left: (Authentic) — Right: (Shanghai 4131) Detailed comparison of genuine vs. replica images for the Shanghai-molded Rolex in-house multifunction chronograph movement 4131. The 4131 movement is manufactured by Shanghai 4130, featuring a 75-hour power reserve. Movement finishing/plating/engraving/assembly are independently completed by Factory C.Therefore, strictly speaking, the Shanghai 4131 movement is a collaborative effort between Shanghai and Clean. Numerous issues present in the previous Shanghai 4130—such as movement stability, chronograph reset failure, rough finishing, incorrect dimensions, winding feel, and rotor noise—are all perfectly resolved in the 4131.Additionally, Clean exclusively contracts the Shanghai 4131 movement. Visual comparisons reveal that disassembled genuine 4131 and SH 4131 movements share identical appearance and dimensions, though minor differences exist in certain shock absorber stones.It’s crucial to emphasize that the previous Shanghai 4130 movement and this 4131 belong to entirely different tiers of quality in every detail. A limited number of pre-release samples have already been distributed, receiving excellent feedback from clients. Of course, this 4131 still requires market validation—we ask for your patience, and it will surely deliver a pleasant surprise. The engraving shown in the images is a preliminary version; the final production batch will be much closer to the authentic design. Overall, the level of replication is exceptionally high.

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