Long time no see, my mailman has good news again today

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would probably have a hallmark/ OM/ AU750 marking if it was... but I'm no expert.

My postman only delivers me my neighbors bills... can we do a swap? 馃榾
 
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I've seen a flagship with that design before, it had a solid gold dial. Gorgeous watch!
 
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Gorgeous watch! The case is very sharp and dial looks practically NOS. Interesting variant. I've seen the "tuxedo" Ultra-Chron with the black dial and a diamond marker at 12, but not one with 4 diamonds.
 
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Contact Longines. They will know.

https://www.longines.com/certificate-of-authenticity

I have an 18K Ultra-Chron chronometer with a gold colored dial from the same era. Longines told me the dial was not gold, only the markers.

But yours has diamonds, so anything is possible.
gatorcpa

Thanks, I was thinking of contacting them.

So, I did. And kudos to the Longines Museum's team, they replied within a day to my request. Solid gold dial is confirmed 馃榾.