Hi Chris,
i dont know that i'm an expert in these but i am at least owner.
The handset between the black dial model and the silver dial model are the same. In your case the NOS silver dial will be quite a bit brighter than the naturally aged hands. This will be most notable when comparing the orange dial highlights to the aged hands - its up to you if looks agreeable to your eye.
Bezels (as has been raised here a number of times now in reference to all Autavia models) seem to have been a choice when originally purchased, so no problem having an MH over a Tachy.
I cant help you on your serial number range but can tell you mine is a 263xxx example.
Here's a picture of mine on the plated bracelet. I have an aftermarket bezel in place but i am hoping to find a very good/mint one to replace it - i dont mind if its an MH but i think my preference would be a Tachy.

Good luck with your project - Darren