Classicwatch Vintage Watches

I have an old Montauk watch, it is stamped Swiss --- Montauk Watch Co 15 Jewel and the only # I can see is 3Ad* the last number or letter could be a D or M is difficult for me to even guess- Case is Fortune Gold filled Serial 1756835
I can't seem to find any info on it. Would appreciate any help as far as age and apron. value. We are going to keep it as it was a part of mother inlays estate. We would like to have it working but does not have to be for sentimental value.
Thanks for any help.
I have pictures but they do will not load as jpg. Any suggestions?

Your watch sounds like a generic Swiss watch, with a generic brand name. There are 100s of such names, so the value will be dependent on the case metal and the maker of the movement.

But....what does this have to do with Jaeger-LeCoultre?