How much is a gun worth with matching serial numbers 79219 and in good condition?

Before we can put a value on it, we need to know what it is. Your question is like asking "How much is a car worth with 79212 on the license tag." Matching serial numbers are only important on a collectable firearm. Hunters don't care what the serial numbers on their guns are and few modern firearms have the serial number in more than one place.