200 dollars in excellent shape
50-100 USD
50-100 USD
1800s to the 1950s or so
50-125 or so
Can't be answered without a DETAILED DESCRIPITON OF ALL MARKINGS and condition.
100 dollars or so
$100-175, depending on exact model and condition.
50-100 US Dollars
1938 was the year
You take it to a gunsmith who has the special tools needed to remove a barrel without damaging the gun.
Early Harrington & Richardson revolvers did not HAVE model numbers, but model NAMES. In your case, the model name is "22 Special".
The gun is likely a Harrington & Richardson (H&R) model 925. The caliber is .38 Smith and Wesson (S&W) special, not to be confused with .38 special (SPL). You must shoot the .38 S&W ammo, not .38 spl.