Help with Seamaster and De Ville

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Hi all,

Came across this Seamaster and De Ville from a grandparent. Likely to be from around the mid 80s, was in quite poor condition so I gave it a quick clean.

I suspect they are not authentic, cannot find another Seamaster with "Quartz" written on the backplate, most seem to have the omega logo underneath the Seamaster logo.

seamaster3.jpg

Photos are attached, any help is appreciated.

Seamaster here - https://imgur.com/a/Ph4xntQ

De Ville Here - https://imgur.com/a/cyeerSJ