It depends on the distance and the type of wood. Pine is soft but Iron wood is hard and the pellet may not penetrate it. The further you are from the target the less energy the pellet will have when it strikes.
The model 600 was made between 1960-1970 it is a .22 caliber pellet pistol, in the condition you describe it is worth in the area of $275. Plus, add 20% for original box and papers.
When you say "Gun" do you mean Pistol or both Pistol and Rifle? The highest quality pellet guns are Olympic class Pre-Charged Pneumatic match pistols. (PCP's). An example would be a Feinwerkbau P44 Match Air Pistol. The cost for this pistol is $1765.95. The very best Match rifle is the Feinwerkbau 800 PCP Air Rifle at a cost of $3245.95. The support system to charge the rifle or the pistol will cost anywhere between $300 to $1,000. However is you want something a little less but Excellent, then there is a very large selection of pellet guns available that will cost you anywhere between $300 to $600.
320 in a pellet gun is average. there are a few that have a higher FPS, but anything that fires between 300 - 400 FPS is normal for a C02 pistol. Rifles on the other hand currently are made to fire above 1000 FPS. The Crosman 1377C fires above 600 FPS but you have to pump it 10 times and it is a single shot pistol
If I am right the pistol was made by By Crosman for Sears under the JC Higgins name. It's a Crosman model 600. 22 Cal C02 pistol. Made between 1960 and 1970. Value is determined by the current condition. Without more information about the working and current condition it is not possible to set a value.
A Winchester Model 427 pellet gun in 22 cal shoots at speeds of between 400 and 600 feet per second. The actual velocity varies based on the number of pumps used and the distance to the target.
600 FPS - Pellet 625 FPS - BB
The gun was made by Crosman, perhaps that will help your search. ----------New answer--------------- This is a model 600 made by Crosman. It is no longer in production.
There is "No" recommended pellet for the model 600. Each pellet has it's particular function. "Waddcutters" are for shooting at targets they make a clean hole in the paper. Hollowpoint pellets are used for rodent control, they mushroom on impact and make a clean kill. Pointed are primarily for distance shooting and Domed are designed as a universal all around pellet.
BB guns (Not Pellet guns) are used for simple short range target shooting called "Plinking" They are also used for basic firearms training. They are not hunting weapons and rarely get above 600 Feet per second. Pellet rifles can exceed 1200 Feet per second and some can be used for hunting.
100-600 depending on specifics
About 600, I think
50-600 usd