1887 J.P.STEVENS, ATLANTA, GA. [HAMPDEN] 18 SIZE, 15 JEWEL, MODEL 2 [HUNTER] with STEVENS PAT. REGULATOR. SERIAL NO.1671.

J.P.Stevens Watch Co. modified Hampden movements [as well as other makers, such as Aurora] by adding their "Stevens Patent" Regulators. This movement started out as a 18s, Hampden, Model 2, 15J [Unclear if it was Adjusted but it's likely it was adjusted by Stevens if it had not already been Adjusted at the Hampden Factory. The Hampden Serial No. should be under the Dial & may provide Grade & Adjustment data].

Single-Sunk Dial has Arabic Numerals & 'Red' 5-min. Chapter. Signed; J.P.STEVENS ATLANTA, GA. The Hour Hand seems wrong as I've seen other J.P.Stevens watches with Open Morning Glory Hands, like the Minute Hand seen here [I also happen to have a set of Open Morning Glory Hands I could fit to this movement]. 

Housed in a DUEBER COIN Hunter Case, Serial #660170.

Case has a Floral Engraved Front Lid & a Plain Back.

Very, very, few of these J.P.STEVENS, Gems show up on the market & most are either priced at $5000 plus, in a GF or Solid Gold Case, or they're incomplete & not in running condition, though this one is. I'd say that this is as rare as the 17J, Ball-Hampden's are.