I have a couple of Opera brand watches that I think are quality so when I saw this come up I couldn't pass it by. All stainless steel case that is 41mmx43mm with a slightly curved case and 20mm lugs it is a very comfortable watch that is only 8.4mm thick. Base pulsations numbers are turquoise from 200 to 60, Tachymetre markings are white on black from 220 to 60 and then there is a black numbers on white outer track from 1-100 (pulse?). Red on silver five minute markers with a red on black 30 minute subdial and white on black second subdial all on a silver main dial. And finally the minute and hour hands are silver with the rectangular shaped sub dial hands and second hand being Carolina blue.
I don't know what the purpose of all the markings are yet but the colors make it a fun and different watch than what I normally wear. Not sure of date but the movement is a Valjoux 7733 which I think is a 70's movement. I have looked since I got my first Opera a few years ago, a power reserve, but there is not much available on Opera Watch Company. A Google search brings up literal opera watches and different manufacturers with a model called "Opera" like Jacob and Co. It's running well and everything functions properly and all hands line up correctly but I will take it in for a checkup and a new crystal but I have to say this is a bit more entertaining than a three hand watch.