What MODEL of rifle? There were several sold under the Revelation brand. Different makers, different values.
The Revelation Rifle marketed by Western Auto Stores in .222 Rem is essentially a Savage 340. Clips are sold by Brownells.com for $30.99 plus shipping
The Revelation 222 is the same rifle as the Savage 340, a single-lug low-end rifle. It lacked any deluxe features save for impressed checkering on some models and was always considered an "entry level" rifle. However, they were well-made and had a reputation for reasonable accuracy. Price range is $150 to $225 depending on condition.
50-300 USD. Made by Savage.
The year that the model 70 .222 cal Winchester rifle was made was in the year of 1936. However, this model continued to be made up until 2006.
$500-$600
savage arms
Value of ANY gun is based on exact make, model, and condition. You gave us one of the three items we need.
The value of ANY firearm is based on the exact make, model, variants such as type of barrel or sights, and condition. Without that information, we cannot offer a realistic answer.
No way to determine without knowing manufacturer and model of rifle.
Savage (Stevens) Model 340
I'd start with Amazon. Your rifle is a Savage model 340, and if you search for Savage 340 scope mount, you will get a lot of hits. The mount and a set of rings is about $53.98. Shoot safe and often.