Iver Johnson can not be dated simply by serial number. There is considerable overlap and even repeating over the years. Would need to know exactly how is marked, including the additional markings under the grips.
age Iver Johnson shotgun serial # 33743
4092
see text: Iver Johnson Arms and Cycle works 1871 - 1978
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You specifically have the Iver Johnson TP-25 pistol. These were produced on US-made frames from the Iver Johnson location in Jacksonville, AR with internal parts produced by Erma-Werke in Germany. Your gun was produced in the late 1980's.
Generally, Iver Johnson revolvers will sell for up to $200 in excellent condition. Typical used IJ prices are half that. sales@countrygunsmith.net
I can write a book about 'what I don't know',,,but I don't know of a 10 gauge Iver Johnson,,,,maybe a 12?? Jim Spear
The value of an Iver Johnson Magnum 22 caliber revolver would be dependent upon a number of factors. Some of these factors would be the age and condition.
A publication entitled Iver-Johnson Arms & Cycle Works Firearms 1871-1993 has a list of most serial #'s with dates of production, published by Gun Show Books Publishing.
The Iver Johnson viking was made between the years 1964-1978.The value of this firearm in the condition in which you describe is 200 dollars.
Most guns in good shape are selling for $350.00 up
Mine is 29989 amd I bought it in 1987 if that helps you a little.