Bonjour Jura, I would have to say late 1940s or early 1950s based on the style of the dial, case and hands— but there is no model name if it’s not written on the dial. Many watches in those days, like today, had no model name. Best regards
Hello, I hope it's never too late I opened this Olma, so I'm asking those who know for more detailed information about that watch. Thank you
There is information about the Olma company on Mikrolisk. Just type the Olma name into the subject bar for the information. https://www.mikrolisk.de/show.php?site=280 Probably not the information the poster is after. But without his having asked specific questions, it is hard to know what information he is after.
Basically the same question from you before rgd. Wilhelm. These are low value watches with off the shelf furniture to create cheap watches.
However, unlike Wilhelm, the manufacturer of Olma watches is well-known, as is that brand of watches. http://montre24.com/brand/Olma/Olmawatch/