Likely is a Savage Model 24 made for Sears under the JC Higgins name. Most of those run about $225, depending on condition.
The value of a JC Higgins model 2012 gauge 583.59 is $250.
I believe you have an air rifle made by Crosman for Sears under the JC Higgins brand name. If so, it's a model 140/1400. Unfortunately you did not state the condition of the rifle so no estimate of value can be given.
50-125
The Winchester Model 12 was never sold under the JC Higgins name.
No such model made by Savage.
$150
$150.00
$1,500
50.00
This air rifle. (If I'm right) looks like a Winchester 30-30 lever action saddle rifle. It was made by Daisy air guns for Sears under the JC Higgins name. it's a Daisy model "1894." Without more information about the current condition of the rifle it is not possible to give an estimate of value.
50-500 usd
25-100 USD, 12 gauge is a shotgun, not a rifle.