depends of condition
if your colt 25 auto is a model 1908 hammerless,it was made in 1927.
1908
A Colt 1908 hammerless .25 with that serial number was made in 1921.
Model 1908 Hammerless .25 auto - 1916
I'm seeing 1908 Colt 25's from 250.00 to 750.00.
colt model 1908 hammerless, 25 cal. serial # 25297 made about 1911................
50-600 usd
A Colt 1908 hammerless .25 with that serial number would be 90 years old. Made in 1920.
According to proofhouse.com, the Colt model 1908 hammerless .25 was made in 1921, making it about 88 years old
50-500 usd
If your Colt is a 1908 hammerless .25 model then it was made in 1928. You may look it up at proofhouse.com.
made 1917. value depends on condtion