Welcome to the Vintage forum. It appears that "Monvis" wasn't a company but rather a brand name of a company variously named Dux SA, later N. Praz and finally Ipo SA, which was located in Biel (source: Mikrolisk - The horological trade mark index). It was registered in 1962. The movement inside will be generic, quite probably a Landeron, if you are lucky a Venus or Valjoux movement.

Hartmut Richter

 

those 3min marks at the 30min totalizer indicates '40s timepiece to me and looks well preserved.

 

Little to add apart from 'nice watch :-!' and that the 3-minute intervals remained quite common well into the 1950s (where I'd rather see this watch - look at its hands.)

Best
Tomcat

Sent from my iPhone using Tapatalk

 

Here's a monvis I had with an unusual case, just as a curiosity and yes,it was unfortunately just a brand name as Hartmut wrote....my had an AS movement,I suppose yours is with a Landeron?!
sorry for the dark pics