Vintage Longines 21 Jewels Automatic Mens Watch Nivarox Mainspring 18k Gf? Not sure where the gold is. Dont know how to open it up either. Winds up and ticks for a bit then stops. Condition is Parts or repair. The item “Longines 21 Jewels Automatic Mens Watch Nivarox Mainspring 18k Gf Parts Repair” is in…