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.
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.
about 1925
about 1916....................
Found a Colt 1903 hammerless with that serial number made in 1917.