Looking for information regarding my late grandfather's 18K gold vintage Longines

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The 124488 could have been inscribed by a watchmaker when the watch was serviced. Some people did that. Looks like another service record was etched inside the caseback below the 140 and also at the nine o'clock position.

Your grandfather seemed to love this watch and took care of it. You're fortunate to have this part of his life passed onto you. Something that was intimate to him and treasured.

May it always bring you fond memories.
Thank you so much for your comments. It is especially valuable to me as he passed away two years before I was born, so I never had the opportunity to know him.
 
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I contacted Longines directly and here is their reply from the archives:

Further to your request, we are pleased to provide the information contained in Longines' handwritten registers.

The original serial number 6'924'869 identifies a wristwatch in 18ct gold bearing the reference 5658. It is fitted with a Longines manually wound mechanical movement, caliber 27M. It was invoiced on 5 April 1946 to the company Wirth, which was at that time our agent for Switzerland.
 
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I have just had two watches - one a gold omega - serviced by [email protected] - they were recommended to me here. Not sure if they do longines but worth asking. Good work and they are keeping good time.