If it was the Colt model 1908 hammerless .25, it was produced in 1921. In 1921 the serial #'s started with 280500 and ended with 303999.
made about 1904
made about 1923
made 1924
Made in 1909
A Colt hammerless .25 with that serial number was made in 1925.
your colt 25 cal semi-auto was made in 1972.
made about 1913/14...........
A Colt 1908 hammerless .25 with that serial number was made about 1912.
A Colt 1908 hammerless .25 with that serial number was made in 1914.
If the model you have is a model 1908 hammerless model? It was made by colt in 1915.
the colt mark 4 is a 1911 model pistol acp (automatic colt pistol ). 80 series was made during the 1980's but was not made in 40cal. from the colt factory, only in 45acp and 38 super.
A person can determine how old their Colt 25 semi automatic pistol is by taking it to a local gun collector. The gun collector can match the serial number to guns that were made during a certain time period.