u/Curiouscollector95

I got this vintage longines from an antique dealer.

He believes the case is silver (I can’t see any hallmarks on the back) however I can’t find any information online to confirm anything about the watch e.g whether it’s a re-release of an older model, the movement etc

The back says longines 150 so assuming it’s an 150th anniversary edition, with serial 21583502

Does anyone know anything about it that can help me?