Springfield Armory still has 2/3rds of the first M1917 rifles
The 30.06 caliber Model 1917 Enfield was developed from the .303 British Pattern 1914 (P.14) rifle. Currently on the Springfield Armory museum collection, there are two Model 1917 Enfields with Serial #1.
In the above photo, the top rifle was made by Winchester in New Haven, Connecticut, while the bottom rifle was made by Eddystone Arsenal in Chester, Pennsylvania. Approximately 2.2 Million Model 1917 Enfields would be produced between 1917 and 1918, and remain in service through WWII and with overseas American allies to this day (The Danish Sirius Patrol still uses it as the M17/M53 rifle).
The rifles were cranked out extremely fast, with the assembly record being 280 rifles a day for an individual craftsman while the assemblers in the various plants averaged 250 rifles per day per man.
The cost of the Model 1914 Enfield to the British Government was $42.00 each. These modified Enfields cost the United States Government, due to standardization methods, approximately $26.00 each.
Eddystone made 1,181,910 rifles with #1 being SPAR 3191 in the Museum’s collection
Winchester made 465,980 rifles with #1 being SPAR 3192 . It was presented to President Woodrow Wilson on 23 January 1918.
Unfortunately, Springfield does not have Remington’s M1917 SN#1.
As the company was the first to start production, they likely shipped it right out. The earliest Remington M1917 rifle I can find is serial number of 137, which was likely made the first day of production. This gun is in the National Firearms Museum in Fairfax, Va.