The Mark series of IWC has been popular for many years in our market, I still remembered that more than 10 years ago there was a factory named MK that made a replica IWC Mark series watch, which made this factory very famous at that time, I do not know if MK is also the MKS we are talking about today.
For good quality replicas of IWC Mark series watches, I suggest you buy from two watch makers, one is MKS, the other is V7. I have gotten the same Mark XVIII replica watch from MKS and V7 before, and found V7 has a better finish on the edge of the case, and because V7 offers Swiss SW300 movement option, the date adjustment on the Mark XVIII is the same as that of genuine watch.
Check the last picture in this article, the movement number SW300 can be clearly seen. By the way, its price is also a bit higher than the one with regular Sea-gull 2892 movement. I do not know why Z Factory did not make any replicas of the IWC Mark series watches, perhaps they know they can not compete with V7, or even MKS, just like no factories want to make automatic Panerai replicas.
Besides the IWC Mark series watches, the Ingenieur and Portofino can also be equipped with SW300 movement by V7, their most popular replica watch is this IWC Mark XVIII that made them famous in this market, and the Ingenieur replicas they published several months ago also help them win a lot of watch fans.
I found many buyers still prefer the common one with Sea-gull 2892 movement, they do not choose this one with Swiss movement, perhaps because it has a higher price, but I think the biggest reason is that they do not believe that a replica can use a genuine Swiss movement. Yes, some people might have been scammed before when they were purchasing a replica with Swiss movement, but found it is not with Swiss movement after receiving, so after that, they became very cautious. On the internet, there are indeed several websites that claim that their watches are using Swiss movements, you should be careful. In our market, many watches can be installed with Swiss movements, most of them are from IWC, Tag Heuer and Breitling.