I think there's an overthinking to these White dial Seiko. Hardly is a white face watch going to be a problem when the crystal & the watch itself is going to reflect far more drastically than walking up on me and seeing a half dollar white dial at 6 feet. One vet said they glowed so strong that you could read your rifles serial number in the dark.Good point Louis. The white dial would have posed security concerns. Thus the use of green tape on almost any reflective surface (impossible on the dial of course )
Just curious, what would have NVA or VC snipers used ? AK-47 seems a good sturdy weapon but not a marksman's tool . The SKS would have had a barrel too short for long range accuracy. Did they have French-era sniper rifles ?
I do agree that these were simply not worn/issued as there were plenty of other darker faced watches out there.
As for your question re: enemy forces snipers weapons 850, I believe that the Moisan~Nagant was used, IIRC.