Renis is a brand that seems to be associated with South America. At least, that is where most examples on ebay originate. Possibly it was a South American-owned brand that ordered watch made in Switzerland, rather like Invicta in that same era. Your watch was probably made in the early to mid 1970s.
The ESA 9154 is very much a built-to-a-budget movement (not in the same league as Citizen and Seiko electro-mechs) but it is transistor-switched and fast-beat so it is capable of decent accuracy.
A forum community dedicated to watch owners and enthusiasts. Come join the discussion about watch collections, displays, watch winders, accessories, classifieds, and more! We welcome all manufacturers including Casio G-Shock, OMEGA, Rolex, Breitling, Rolex and Tudor, Seiko, Grand Seiko and others.