Depending on condition, $30-$120
$100, more or less
No such maker. However, there is a firm called Harrington and Richardson and they did make pistols in 38.
25-75 USD or so
May not be marked, depending on age.
10-100 USD or so
Can't be answered witout knoiwng all details.
50-100 USD or so
The Harrington & Richardson 925 uses the .38 S & W (Smith & Wesson) cartridge. They starting making them in 1964