Congrats on your find. Steel Longines from the ‘60s are usually quality, well made pieces that are wearable and collectible. This will have a cal.340 movement. The crystal is in poor shape and should be replaced. Cleaning the dial is almost always a bad idea. The outcome will most likely be worse than when you started. If the watch keeps good time - have your watchmaker replace the crystal and wear it in good health.
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