The Watch's are getting Newer! A 1908, 21 Jewel, 18 size, John C. Dueber [last of the 18s JC's], NAWCC Data Base has this Model as being One Run of 400 but more likely 600 because this one's serial # {2527513}is after the NAWCC Data Base's last Serial #for the Run. Also there is some confusion because these later Serial #'s were interspersed w/ John Hancock's {or vice-versa} which are basically the same watch w/ a different name on the Barrel Plate {much like the "Tank Badge Engineering" that was common practice on Matchless & AJS Motorcycles after WWII}. 

This one has a Double Sunk, Enamel Dial, w/ Arabic "Script" Numerals & "Closed" Morning Glory Hands. 

The Movement is Stamped; 2527513, Safety Pinion, Hampden Watch Co. Canton O., Double Roller, Adjusted to Five Positions as well as 21 Jewels & John C. Dueber in Gold/Gilt Lettering. Like the late model John Hancock's this one has Gold Screw Settings, Sapphire Pallet Stones, & a Steel Escape Wheel.  It also had Gilt Plate Screws though some of these have been replaced w/ polished nickel head screws. 

Currently Housed in a Dueber 4 Oz. Coin Case. An Open Face, 3-Hinge, Model that's quite Thick [& may be replaced w/ a Gold Filled Case later]. Another Rare Dueber-Hampden I'm glad to have acquired. As far as value goes, the 21J's get lumped in with the 17's so it's hard to tell. My 2012, "Complete Price Guide to Watches" shows a $300 difference between the 17's & the 21's in ExFn & by their rarity I can see them commanding a higher price.