This is really a very old rifle. It was made between 1924 to 1950. Crosman offer a service to locate repair shops that repair older air rifles. See the link below and follow the prompts.
From your description I assume you are asking about the Crosman model 102 Rifle not a pellet gun. The 102 is a .22 caliber pump action rifle There are 3 variations of this rifle the 102, 102 OSS and 102 CG. I am going to guess yours is the simple model 102. The early versions had simple checkering on the forearm 1929-1950. In good condition it is worth somewhere in the area of $125-$165. I suggest you read the Blue Book of Airguns 8th edition. there is a lot more info about this model. You can find the book in any large book store.
Between $125 - $165
I may have an answer for you. While doing some research on the Hercules air rifle I had trouble locating it in my catalogue. Then I realized that Hercules was the maker of the arcade game with rifles. Not the rifles name or maker. It was then that I realized that Crosman once made Air Rifles for arcades. The Model 102 "Camp Perry" introduced in 1931 used a hose attached to a C02 tank and was used only as part of an arcade gallery. I think this is your rifle. The Maker may have their name on the rifle to verify this. It looks very similar to a Crosman model 101 except it has a hose right in the bottom middle of the rifle. It also has a wooden stock and forearm. The Barrel looks like 2 barrels one on top of the other.
In good condition it would be worth between $125 - $165. For the Owners/Parts manual see the link below.
Between $125 - $165.
The model 102 Cub was made between 1952-78.
The model 102 rifle is loaded by removing the cap on the end of the barrel.
The Daisy model 102 Cub was made between 1952-78
1975
What condition is it in....
This model was made by Crosman from 1929-1950. However asking "What is it worth?" is like asking what is my 55 Chevy worth without describing the condition of the car. It it still working. Does it still hold air. What condition is it in. Excellent ( Like brand new) Very good, good, fair, or poor. Give some details about the rifle and I'll try to give you an estimate of it's value. It could be worth a tidy sum of money or nothing.
Yes