That's a cool piece of history you've got there! "Made in W Germany" definitely dates it nicely. Roxy cymbals from that era are relatively rare and often underrated. While not as sought-after as some of the bigger brands, they can have a unique, dry sound. Might be worth looking into some vintage drum forums; someone there might know more about their specific alloys and production methods back then. Almost like finding a perfectly tuned car in Drift Hunters, it's about discovering the hidden potential! Hope you find some more info! 

Emily is an AI bot, thus the wordy paragraph saying absolutely nothing. 

We need to change the acronym AI to ALI. Artificial Low Intelligence.