1940's Sergines

I suspect that is a Longines and not a Sergines.

A great source for pocket watch info is the Pocket Watch Database:

https://pocketwatchdatabase.com/

Unfortunately, it doesn't appear to show Longines (or Sergines) as one of the known manufacturers. Longines did make pocket watches, and that appears to be their logo script.

The real clues are inside the case. Got a case knife?

This is what I found inside. 

Thank you very much for your help!

Typical caveats about pocket watch cases being separate items from the watch itself and case markings almost always having no pertinence to movement apply.

This is the second pocket watch movement of late that shows nothing identifying from the back. I wonder if they marked the other side, under the dial? I know that American movements were stupendously decorated and marked, even though the owner probably never saw inside.

Thank you for your comment! It makes sense. Too bad I can't access that part of the watch at home. I will take it to an expert in the field to find out more information about this timepiece.

Thank you so much for your help!

The watch looks quite similar to this one:

https://www.antiques-atlas.com/antique/1945_longines_pocket_watch_with_chain/as170a5246

Perhaps that can be a jumping off place for getting more info.

Best of luck with it.

Amazing! Many thanks for your research! 🙏

Sergines seems to been a real watch brand.  See here. Interestingly, it may still be a Longines, or it may not if it is old enough.

Thank you for your comment! Yes there seems to be a Sergines brand. Strange that there isn't much information online about the connection between Sergines and Longines.

Only thing to add to the data provided is that the Sergines name, with that font was trademarked in the US in 1947 by Longines and allowed to expire in 1992. See here https://trademark.trademarkia.com/sergines-71522591.html   May help with fixing an earliest date for the watch. 

Longines was always opaque in its business dealings. They had relationships with watch manufacturers that appeared to be ownership interests, but may have been partnership interests.

I am going to speculate based on what little information that you have. The two previous trademark holders of the Sergines name were L. Ulysse Bourquin and E. Sagne-Geiser. I suspect Sagne-Geiser is the successor company. The Bourquin name shows up in many early watch companies, such as Leonidas.  Who knows how closely related they were. 

Those companies also made Elegancia 1a and Caile Ferate Romane pocket watches before Sergines. Caile Ferate Romane was the name of the Romanian national railway, so presumably those were railroad caliber watches. Most Sergines examples that I see for sale seem to be from Spain. It may be that they were marketed to an Iberian market.

You say that it is a 1940's watch, I am guessing from family history. The nickel case tells me that it was a moderately priced watch. It was probably what we would call an "entry level" watch from Longines targeted to a specific regional market.

Enjoy it, it is a cool piece.

Thank you so much for your amazing help!! So much valuable information in one comment 🙌 I’m grateful to have more knowledge about this timepiece  that was part of my family's history. 

Thank you so much for your coment and knowledge! 

I jumped the gun on that one - the font looked somewhat similar, but on closer inspection, they are very different. 

As others have pointed out, it does appear that Sergines was indeed a brand, with an apparent connection to Longines.  When it comes to vintage watches, @Aurelian is one of the most knowledgeable WC members. You may want to seek out some of the other posts related to vintage watches in general, since he & @chronotriggered  provided a wealth of information, including some helpful links.

Regardless, it's a super cool watch to have, especially with the family connection. I have 3 pocket watches with no personal connection whatsoever, and even though I don't wear them, I find them fascinating. 

Longines ?

Yes! From the knowledge I've absorbed from the comments above, it seems Longines and Sergines have a connection.