If your pistol is a Model 1903 32 smokeless rimless (.32 Auto) it would have been made about 1933.
colt hammerless 32 cal. model 1903. #253741 made 1917
If the piece is a : "Colt Model 1903, hammerless, 32acp" Then the serial # 221838 was produced in the year 1916. This is according to "Colt's dates of manufacture" by R.L. Wilson.
The date of manufacture of Colt 1903 Hammerless .32 is 1916.(193000-234999)
For the 03 hammerless .32 model, around 1928
Your 1903 colt hammerless 32. was made by colt in 1920.
For model 03 hammerless .32 produced around 1918
1934 for the Colt 1903 hammerless .32.
You can find out at Proofhouse.com in the Colt tables.
about 1925
about 1916....................
Is this a Colt 1903 Hammerless .32? If so, according to the information found at http://www.proofhouse.com/colt/index.html it appears your Colt 1903 was manufactured in 1920.
The 1903 Colt Hammerless .32 with serial # 137295 was manufactured in 1912. about 1913