MD,
The #1 had "Stub Twist barrels" and the 1S had "Imported NitroSteel barrels." for most of the 1S life. The 1915 catalog lists "Imported Cockerill Steel Barrels." The S marked frames continued into use as it 'morphed' into the Field grade until the supply was exhusted. My analysis of the catalog listings shows the 1S grade gone by 1918. The 1917 December price list mentions the 1S but stated it was discontinued.

Last edited by Walter C. Snyder; 02/16/07 01:08 PM.
Walter c. Snyder