AFAIK, there was no change on the finish of the Master 8 Days.
On the RG version, the dial has a sunburst finish, as you can see on this bad picture taken with a flash:
On the SS, I think ( not sure ) that the dial has a sunburst finish, too:
The thing is that I don't have good quality pictures of this model, so it will be difficult for me to go deeper in the details, but if you saw this kind of finish in some macros, then I highly doubt that the dial of the Master 8 days has varied.
The thing is that this kind of detail is noticeable in some light conditions ( strong light, like sun or flash, for example ).
If you find one, ask your seller to provide you some good macros.
Best, and sorry to not have been very helpful on this matter.
Nicolas.