Gun shop, gun show, e-gunparts.com
Value of ANY gun is based on make, model, and condition. You gave us ONE of the three. Ruger has made several different pistols in .22 LR over the past 50 years. Get us some information, we will try to get you an answer. Start with model, describe type of metal, barrel, sights, condition.
Benjamin made this model from 1946 to 1985, but did not start serializing them until 1957. I also have a Benjamin Franklin that has no serial number. Before 1957 it is not possible to set an exact date. Just know it's OLD. The 137 is a .177 caliber pellet pistol the 132 is a .22 caliber pistol and the 130 is a BB pistol.
Check with a gunsmith. These were inexpensive guns to start, and there are not many sources for parts. Depending on the part, a smith may be able to make one, but the cost may exceed the value of the gun.
Wolff gun springs, Brownells, and gunpartscorp would be places to start. You will need to verify make and model of pistol- Brevette is often found on European arms, and is not always the make.
A new 1911 pistol, imported from the Philippines will start around $400--$450. Decent weapons & reliable. A new American-made 1911 can start at $650 for a base model and go all the way to $2000+ for custom, high-end models. These prices are for fall 2015.
I would start by checking the web under "Air Gun Repair" or see the link below.
1. Start with the safety in the "ON" position. 2. Push down on the lever above the trigger on the left side to open the breech. 3. Remove the cylinder from the barrel. 4. Put 8 pellets (.177 caliber) into the cylinder and make sure they are flush with the cylinder. 5. Replace the cylinder into the barrel, Close the breech. 6. Remove the left side of the pistol grip from the bottom. 7. Install a C02 cylinder into the grip and tighten the screw into the bottom. 8. Replace the grip cover and release the safety. 9. Point in a safe direction and fire.
Starting pistol
Pistol beetle
1. Start with the safety in the "ON" position. 2. Push down on the lever above the trigger on the left side to open the breech. 3. Remove the cylinder from the barrel. 4. Put 8 pellets (.177 caliber) into the cylinder and make sure they are flush with the cylinder. 5. Replace the cylinder into the barrel, Close the breech. 6. Remove the left side of the pistol grip from the bottom. 7. Install a C02 cylinder into the grip and tighten the screw into the bottom. 8. Replace the grip cover and release the safety. 9. Point in a safe direction and fire.
Lets start with, What model is the Crome Crosman of yours. Is it a pistol or a rifle. Crosman has made over 100 different models. And there is NO model called "Crome." Resubmit you question with the model number so I and Identify the value.
Your pistol is commonly known as a "starter gun"- as in the start of a race. .22 caliber BLANK ammunition can be found at most larger gun shops. Please do not ever attempt to fire anything EXCEPT blanks in your pistol.