50-125 or so
Can't be answered without a DETAILED DESCRIPITON OF ALL MARKINGS and condition.
Early Harrington & Richardson revolvers did not HAVE model numbers, but model NAMES. In your case, the model name is "22 Special".
100 dollars or so
No, but it is rather old. The revolver Model .22 Special made by Harrington & Richardson, and the rather rare .22 Special cartridge were both made in the 1900's. To be classed as an Antique Firearm under US Law, it must use loose ball and powder (like a musket) or have been made in 1898 or earlier.
$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.
38 special is only a revolver caliber. that's like saying a 44 magnum revolver or a 500 special revolver. a revolver is a revolver
No published history
Well, those are 5 chambers, not 5 cylinders. Bearing NO connection to the US Secret Service, the name was used by both A J Aubrey and Harrington & Richardson. Value is in the $100-$150 range. Think the term you were looking for was top break revolver.
Warner Arms Corporation, Brooklyn, NY and Norwich, Ct. Established in 1912, this company marketed firearms made for them by "OTHER COMPANIES". These companies included N.R. Davis & Sons, Ithaca Gun Company, Iver Johnson, Harrington & Richardson and Forehand & Wadsworth etc. In 1917 the company was purchased by N.R. Davis & Company. Please note that your revolver is NOT a .38 Special, but uses the .38 S&W cartridge.