Vintage SEIKO "Time Sonar" 7015A-6010S, ca. 1978 (from Tim)

I will later on do some work with Crystal Clear...
I am quite sure I can buff out quite a few of these surface scratches on the back glass (acrylic). As you can clearly see here, the crown is recessed. this makes perfect sense for an automatic watch that cannot be hand wound.
The push on the crown to set the weekday is a function that is quite often overlooked. It is a feature of the movements based on the 7005.