The three movements compared in this test are the older Clean‑factory Cal.3285, the genuine movement, the Clean movement (Dandong‑made), and the Shanghai‑based movement.

We fully disassembled all movement components and took detailed close‑up photos. Several differences emerged after comparison:

1. Both the genuine movement and Clean Cal.3285 deliver approximately 70‑hour power reserve, while the Shanghai‑built movement offers only 40 hours.
2. Most parts of the genuine movement and Clean Cal.3285 are interchangeable. The Shanghai Cal.3285 is modified from the Cal.3135 base instead of being built from a 1:1 original mould. It shows substantial differences in workmanship, dimensions and mechanical precision. These distinctions can be observed in the reference photos if you look closely.
3. The Clean Cal.3285 is built upon the Dandong Cal.3235 platform with an added GMT module, so its stability and power reserve are unquestionable. It is expected to deliver solid performance.
4. According to Clean Factory, the Dandong Cal.3285 will be sold exclusively by Clean Factory.
5. We have verified the 40‑hour power reserve of the Shanghai Cal.3285. However, its long‑term stability remains untested. Hopefully it can keep reliable time‑keeping and provide buyers with an alternative option.

Conclusion During disassembly, obvious discrepancies were found in the Shanghai Cal.3285 due to the lack of a true 1:1 mould. Even so, it will undoubtedly capture a share of the market despite those mechanical differences.

Most recent 3285 movements on the market have been upgraded to the 70‑hour power‑reserve variant. Manufacturers including Clean, C+ and C+ PLUS have rolled out this updated version with only a slight increase in complete‑watch prices. Treat the attached movement comparison images for reference only, as the nuances are hard for most people to identify.

It is also worth noting that VS Factory has not released any Rolex GMT‑Master II models to date. This may stem from differentiated market competition or movement‑supply contractual constraints.

Nowadays, Rolex replica movements are highly homogenized, relying mainly on either Dandong or Shanghai bases. It is more practical to focus your attention on overall watch finishing rather than over‑analyzing movements.