I have ser# 149270K and to the best of my investigation the answer is early 1920's.
Cannot be answered without you providing a serial number to your Springfield model 1903 bolt action rifle.
Your Springfield model 1903 bolt action rifle was made in the year 1905 with the serial number that you have supplied.
Your Springfield M-1 Garand was made at springfield in 1944 with the serial number that you provided.
You need to repost, give the model and caliber, and the complete serial number. N is not a serial number, and there is more than one Springfield.
With the serial number that you provided,your Springfield model trapdoor rifle was made by Springfield armory in 1883.
With the serial number that you provided,your Springfield Trapdoor Model was made in the year 1884.
With the serial number provided,your Springfield M-1 Garand was produced in 1945.
With the serial number that you provided,your Springfield model 1884 rifle was made in the year 1889.
Your Springfield model 1898 Krag rifle was made in the year 1898 with the serial number that you have provided.
Your serial number indicates that your 1898 Springfield rifle was made in the year 1898.
Your serial number indicates that your Springfield model 1903 rifle was made in the year 1919.
Your serial number indicates that your Springfield trapdoor model rifle was made in the year 1887.