How long is a tape measure? (My favorite mother-in-law question).
Point is, much more information is required, and likely only a rough estimate will be found on-line due to the lack of opportunity to visually inspect the pistol.
Rough estimates of market value can be found by Surfing sites on the www, and try to find your model. Average out 4 or 5 listed prices & that's about as close as you are going to get without a visual inspection from a dealer that is qualified and experienced.
'56 Sport King owner
50-500 usd
100-1000 depending on specifics
Strum Ruger made many 22 caliber hand guns. It would help if you Identified the model
In a Gun Shop
$45 for a Thompson
10-60 usd
50 USD
100-1000 depending on exactly what you want/have.
Gun shop, gun show, Egunparts
A beratta 8040f handgun can be at least $389.95.
25-75 USD
$75-$125, depending on model and condition.