I think you may want to check your numbers again. I believe they are 799.2028 not 7892028. If I am right, then the air rifle was made by Daisy air gun co. for Sears using the JC Higgins brand name. None of my catalogues list this particular number but I know that all airguns that start with 799 were made by Daisy and all JC Higgins airguns that start with 126 were made by Crosman air gun co. I suggest you contact Daisy directly to see if they can give you an estimate of value.
Daisy has a service to evaluate older Daisy air guns. (See the link below.)
$50-$100.
25-85 USD
Please list the model exactly how it appears on the rifle so we can properly identify it.
50-100
The value of a JC Higgins 22 caliber rifle model 25 depends on its condition. This gun in excellent condition is valued between 100.00 and 165.00 as of 2014.
About $150-$200, depending on condition.
25-125 usd
50-125
It has only shooter's value. There is no real collector interest.
made by Marlin for Sears 1959 to 1962
depending on condition 100 bucks
50-100 USD