Blue Book of Gun values is a place to start.
There is no such thing. The Cowboy Ranger revolver is not made by Colt. The reason it has Colt stamped on the barrel is because you can use Colt ammunition. The Cowboy Ranger revolver is a pre WW1 revolver that was distributed in the US but also brought over from the soldiers as they returned from the war. If you can find any information on the manufacturing date and how to identify it please let me know
The Ranger Sequoia is like a revolver with a long barrel.
Single action revolver, made in Belgium, roughly WW 1 time frame. Value $125-$175 depending on condition.
20-80 USD or so
$50-$100
Unknown Belgian maker. These were copies of the Colt Model 1877, made in caliber .38 Colt Long. While a .38 Special WILL chamber, I would not reccomend shooting it.
is there a "special tool" to put torsion keys on a ranger
5-40 usd
Late 1950's. 1961
look on pokemonranger.com for shadows of almia and http://www.serebii.net/ranger/special.shtml for Pokemon ranger special missions
Most likely a copy of a S&W. Nominal value
Special mission on the Ranger net