Vintage Longines Pocketwatch from 30’s

I’m pretty sure this is from the 30’s. It was my granduncle’s who was a politician in Cuba at the time. This was purchased from Cuervo y Sobrinos, the most famous and prestigious jewelry store in Cuba at the time, and the face is marked as such. It still works perfectly and is in great condition. I haven’t found any like this one and was wondering if anyone had any idea as to it’s value or any other information on it.