Up for sale is a vintage ELGIN NATL WATCH CO. pocket watch. The number is  18997003 I hope that helps you date it. I set it and wound it and watched it for a few hours and its been running and keeping Time. It has not been tested for accuracy.  Please check all the pictures and bid for what you know about pocket watches as I am selling it AS IS. If you have any questions please email and I'll try to help.   *** BUYER TO PAY $8.00 SHIPPING IN THE U.S.  *****