From the American Horology Archive:

E. Howard Watch Co. (Keystone)

Grade: Series 11

This free lookup is part of an independent research project maintained by the Pocket Watch Database.

It's funded by collectors who choose to support the archive.

Manufacturer:	E. Howard Watch Co. (Keystone)
Manufacturer Location:	Waltham, Massachusetts
Movement Serial Number:	1183861
Grade:	Series 11
Variation:	DR.SpringClick
Model:	E
Estimated Production Year:	1913
Run Quantity:	6,000
Grade/Model Run:	1 of 12
Grade/Model Total Production:	25,100
Variant Est. Production:	6,000 (16S-ME-21J-ONL-A5PTI-DR.SPRINGCLICK)
Size:	16s
Jewels:	21j
Jewel Setting:	Burnished Jewels
Movement Configuration:	Openface
Movement Finish:	Nickel
Movement Setting:	Lever
Plate:	Bridge Plate
Double Roller:	Yes
Regulator:	Micrometric
Hairspring:	Breguet
Standard Dial Type:	Single-Sunk
Adjusted:	Yes
Adjusted to Position:	Yes
Adjusted # of Positions:	5
Adjusted to Temperature:	Yes
Adjusted to Isochronism:	Yes
Railroad Grade:	Yes
Railroad Grade Classification:	Class A
Movement Markings:	E. Howard Watch Co. Boston U.S.A. Railroad Chronometer Series 11 21 Jewels R.R. Adjustment Temperature Five Positions Pat'd '08 Double Roller
Case:	Various
Run ID:	271.G1.16S181.M1.O187.L57.21J40
Database Version:	v52.958