what is the value of a 1919 colt automatic hand gun
Proofhouse.com has Colt sn data.
A Colt 1908 hammerless .25 with that serial number was made in 1912
your colt 25 cal semi-auto was made in 1972.
100-800 USD
@ 1972
Best to ask a gunsmith for help.
@1914
A Colt 1908 hammerless .25 with that serial number was made in 1914.
100-800 USD
Around 1972 or 1973
somewhere around 1973
Without more of a description; 10-100 USD