Agree. Longines 832 manual wind movement started production 1974. A slight modification of pvs 420, and the 19.4 before that. Most Swiss watch companies were facing hard times in the 70's, including Longines. Lots of similar watches to the one you show, with gold plating and stainless back. A movement and inner caseback shot sent to Longines might allow them to provide more information through their historical watch service. This particular watch is not a collector's item or such, but has a good in-house movement (later Longines often used other brands movements simply finished or signed by Longines) and with a service, some cleaning, and a new strap, could be a nice piece, especially given the family history. If you do replace the band, make sure to keep the original buckle (if it is still the original), as lots of folks toss them with the band.
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