Welcome aboard here and thanks for posting such lovely pictures!
That is one beautiful Longines. Congratulations!
We always ask people with vintage watches if it's been recently worked on, but since you got it from a watchmaker I'm assuming it is.
That is probably a 6651 calibre inside. This was developed from the Longines 431 that had what is called a high-beat (36'600 bph) and was essentially de-tuned to run at a much more reasonable 28'800. The higher beat was very hard on the movement and most watches with such a higher beat have lubrication problems due to the very high speeds involved. Reducing the beat to 28'800 was a solid move on Longines' part in order to have very long-lived, high quality movements in their watches.
The watch should date from the early 1970s and looks to be in really great shape.
Quite a nice movement: adjusted to four positions and temperature, as well as the KIF shock absorbing system. You should get many years of very nice time-keeping from that movement, and the design of the watch has retained its elegance over time...
And if your watchmaker is giving any more of those away, let me know!
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The watch has been donated by him to a spanish forum where I collaborate and after a lottery, I've been the lucky one
Now this is one of my prouds, and the only Vintage watch I have. Just a pitty of being goldfilled, as I like steel more, but.... it's been free
That's a beautiful Longines. Congratulations!
Regards from Sunny San Diego..........Tom
"There are two kinds of people in this world, my friend, those with loaded
guns and those who dig!"................Blondie to Tuco in TGTB&TU (1966)
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