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I know nothing of this maker, but the watch's condition is outstanding. Congratulations on a successful quest!
Thank you. O&A has a very cool history, but is mostly know for selling Diving and Chrono watches during the late 60's and early 70's direct to public and to soldiers during Vietnam war. They also bought-up much of Breitling's inventory when they went bankrupt in the 70's and produced some cool pieces where you can clearly see the use of inventory they bought.
Here is a link to their history page if your interested in learning more.
https://ow-watch.ch/pages/aboutollechandwajs#:~:text=1956,: OWZ Ollech & Wajs Zürich.