Yes, I reached out to Longines and requested an extract from their archives of the watch. Will be interesting to see what they say about it.
I heard back from Longines about the watch. I'm surprised they responded so fast. To share:
Dear Mr. Navarrete,
We thank you for contacting us and for your interest in Longines watches.
Further to your request, we are pleased to provide the information contained in Longines' handwritten registers.
Originally, the serial number 12'732'445 identifies a Longines mechanical self-winding movement, caliber 343. It was invoiced on 4 February 1965 to the company Longines-Wittnauer Watch Co., INC., which was at that time our agent for the USA.
The other parts of the watch were produced locally under license from Longines. Unfortunately, since the relevant archives are not in our possession, we are unable to provide any further information on your model.
May we kindly ask you to provide us with your postal address so that we can send you the Extract from the Archives?
Waiting for your reply, we remain at your entire disposal for any additional information you may require.
Sincerely yours,
Anne Develey
Branding and Heritage
Compagnie des Montres Longines Francillon SA
CH-2610 Saint-Imier, Switzerland
Phone +41 32 942 53 08