New Member/Inherited Early 10ga.

[Fishtail]

It's a nice looking gun, as others have noted.

No, you cannot improve the case colors without compromising the gun's value.

My opinion, from the pics, is the butt stock has seen some repair/resanding/refinishing. It's too clean and smooth and dent free as compared to the forend wood (which looks original). It also looks like there could be some wood filler behind the right side lockplate.

It's also probably just a plain case of someone having a second set of barrels added (or the gun was bought new with two sets). Since one set is 23", it's likely the 30" tubes were bought to remedy the cutting of the tubes that became 23".