Where you cannot find details for quality Swiss watches, a friend of mine who deals in all types of time pieces, suggested you find a trusted dealer/seller there, ask them to remove the back and check for a reference number. Note it down and either Google the number or contact ETERNA directly with the query and reference number. From the case and dial design, the 80’s decade seems about right for a 900 series but you’ll have to do your own Sherlock on it. Worth a try.
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