Lavina watch made Cal. 105 for manual winding wristwatch. I don't know your watch is observatory tested one or not. Also it can be a possibility to certified by COSC chronometre. Also I'm not sure the watch I posted is passed the observatory test and got a certification even it seemed to be made for

I hope it can be helpful. It is observatory trial pieces using Lavina Cal. 105. Original pictures are taken from the amp;subpage=scheme1&category=wristwatches&id=467

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