The book says $350 to $500.
If it is a Colt Vest Pocket model, 1921.
Depends on condition. 25-155 USD
@1911
Up to 700 USD
10-800 USD or so
depends on condition and age. age depends on serial number
Model 1908 Hammerless .25 auto - 1916
25-200 usd
it is worth about £278/$313.
if it's the 1908 hammerless 25 cal then made abot 1920
Lacking any more information, 50-800 USD or so