I'm completely ignorant when it comes to Swiss PWs, so I'd appreciate some help and opinions on this particular piece.
It's a Longines, and signed as such on the dial, movement, and case. As can be seen, the dial has seen(much) better days.
The movement looks to me to be 15 jewels, and is not currently running as it's badly gummed up. Movement s/n is 3033168.
The case carries no hallmarks, so I'm guessing it's nickel silver/german silver. The marking is "EFCo" over an eagle. It's also marked Longines. Case s/n is the same as the movement s/n.
It's about an American 16 size, and seems to be roughly the same thickness as a standard American watch of this size.
Based on the case style, if it were American, I'd guess it to be from the 1910s or so, but as I said I'm clueless about Swiss watches.
Can anyone give me any further information about the age as well as how correct this case/movement/dial/hand combination is?
I apologize for the quality of the photographs. They were taken with my iPhone in the fading evening sun. I can provide better tomorrow if needed.