Hi Guys I would appreciate your knowledge/opinions on this Longines that I have discovered and wondering about adding to the modest collection. I read the case marks as imported 1927 by Arthur Baume ? The movement dates to 1925 and appears to be a decent quality I believe?

Understanding the Context

Any other comments... Longines founded by Ernest Ferancillon , erectied a factory in 1866 to conduct all of the operations of watch finishing in one plant as opposed to the traditional method of passing the movement f… Longines, seemingly more than most watch companies, provided contract watches, also known as a private label watch, furnishing a large number of private label watches to dealers in the U.S. and Canada. Below is a table of private label Longines watches started with information contained in a...

Key Insights

Well, pic #5 shows the mark that was registered by Longines in 1889, and pic #4 shows the date of 1878 right on the movement. I understand marks were sometimes used before they were registered, but how could this movement possibly predate 1878 as originally claimed (1865-1876)? I had a Longines "Olympian" with Caliber 6652 movement marked with a serial number in the 51 million range. I emailed Beatrice Donze, museum curator, at Longines and got a very interesting explanation. I have in for service a Longines Deck Watch Chronometer that basically is a robust pocket watch movement mounted in a gimballed frame with double wood case in the manner of a ship's chronometer.

Final Thoughts

The movement is approximately 36 hour run time and is stem-wind lever set; you have to unscrew the... As a prelude to restoring my great uncle's 1880-vintage Longines pocket watch I bought 4 different movements of the same era for spare parts. Well, it turns... I have a vintage Longines watch. I need to open the back. I am having trouble figuring out how.