What vintage Longines is on your wrist today?

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Longines Admiral (Cal. 508) found barely worn (but without strap or bracelet) with box and papers (dated 1979):
 
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Back from service, matching hands now, and relume. Quite nicely I must say. Quite satisfied
 
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I only really put it on my wrist for the photo - but then back to the box it went until I can get it back in fighting form

 
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No sailing tomorrow so some quality time with one of my faves.
 
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Need some help with this one. I don’t have the tool to open the crystal to see the serial number or movement. Can anyone help me identify this one? It keeps great time.