Hamilton 992 gold pocket watch, 21 jewals

I have a Hamilton gold pocket watch that runs. The face is white with black numbers for the 12 hour numbers, red letters for each 5 minutes, and a 60 second clock. On the back it says, "Hamilton Watch Co. Lancaster, Pa. 21 Jewals 992 Douele Roller Made in U.S.A. 1727312 Adjusted 5 Positions." The inside of the back cover says, "Keystone Watchcase JBoss 25 Years 5429590." Etched into the inside of the back cover it says, "X4723, 3-28-32, 1-17-33ms, 8-17-37ms, 8-21-39ms, 10-4-47, 1-17-49ms. The outside of the back cover has a shield in the center and a leaf design around the edge (very warn). I was given an estimate of $15 for its value, but I'm skeptical. I appreciate your thoughts.