New to me...Looking around there is "some" info in the internet but nothing that stands out. Is this something you're considering buying or something you have already?
I bought it along with other watches a few years ago and have kept it since then, almost forgotten. But I never had the intention of selling it due to the lack of knowledge I have about the watch.
My advice is to take it to a watchmaker and have the movement inspected. Maybe it's a high-grade movement... or maybe it's not. Externally, you can't really say much about it other than "looks like 1970s styling".
Probably meaningless but Google Translate says "rewel" is Indonesian and one synonym in English might be "Precise".
They made also this little beauty Picture borrowed from: Rewel Vintage Dive Watch / Skindiver With Killer Patina | WatchUSeek Watch Forums