Around $100 in good condition.
What condition is it in, both mechanically and physically. That determines the value
It was manufactured in 1978
It all depends on age, use, and condition of the rifle. Is it in Poor, Fair, Good, Very good or Excellent condition. Sheridan made 4 different model C series. The C Silver Streak, C9 Silver Streak, CB9 Blue Streak, and C9BP. Which one are you asking about?
The sheridan H series in good condition is roughly worth $100
It was manufactured in 1978
I Think I've located the answer to your question. A short history. Benjamin air rifles and Sheridan air rifles once were separate companies. Sheridan developed the C series 20 caliber series of rifles. Benjamin bought Sheridan and continued to make the C, 20 caliber series rifles. They also made a .177 and a .22 caliber C series rifle called a Benjamin. Crosman bought out Benjamin (in 1992) and decided to continue making the C series. With the name Sheridan on the .20 cal rifle and Benjamin on the .177 & .22 cal rifle some rifles also had the Crosman name on them. ( confused enough?) Because you have asked for about a Crosman C9 I believe yours in one of the older models. It was most likely made around 1990. From 1949 to 1990 they were just called Sheridan later called C9 and CB9. But I am not positive.
1974 see the link below
The C and CB series (NOT the C9 Series) in fair condition is worth around $55 to $85. There are many versions of the C series Sheridan Let me explain: Sheridan made air rifles started in 1945 and made a few variations of the C series. Benjamin bought out Sheridan and continued to make the C series ( C9, CB, CBW CW ) From 1949 to 1990 it was marked Sheridan. In 1972 serial numbers were redone and started with #000000. Crosman bought out Benjamin (1992) and continued to make the C series Rifle (It's very popular) The rifle was made in .177, .20, .22 caliber. From 1998-2000 Crosman marketed the C series .177 and .22 Caliber as a Benjamin and the .20 Caliber as a Sheridan. You may see a C9 Silver Streak or a C9 Blue streak. They are the current C series rifles At one point during the 1950's the rifle was marketed as a Benjamin Franklin as a marketing ploy. Benjamin Franklin had nothing to do with it. But his name got stuck on it anyway. Along the way the rifle has also been marketed as a Benjamin / Sheridan.
I Think I've located the answer to your question. A short history. Benjamin air rifles and Sheridan air rifles once were separate companies. Sheridan developed the C9 20 caliber series of rifles. Benjamin bought Sheridan and continued to make the C9 20 caliber series rifles. They also made a .177 and a .22 caliber C series rifle called a Benjamin. Crosman bought out Benjamin (in 1992) and decided to continue making the C series. With the name Sheridan on the .20 cal rifle and Benjamin on the .177 & .22 cal rifle some rifles also had the Crosman name on them. ( confused enough?) Because you have asked for about a Crosman C9 I believe yours in one of the later models. It was most likely made around 1997-2000.
A short history. Benjamin air rifles and Sheridan air rifles once were separate companies. Sheridan developed the C9 20 caliber series of rifles. Benjamin bought Sheridan and continued to make the C9 20 caliber series rifles. They also made a .177 and a .22 caliber C series rifle called a Benjamin. Crosman bought out Benjamin (in 1992) and decided to continue making the C series. With the name Sheridan on the .20 cal rifle and Benjamin on the .177 & .22 cal rifle some rifles also had the Crosman name on them. ( confused enough?) During all this confusion and name changing the C9A came along. I have 4 reference bluebooks on air guns and not one of them can give me a date for the C9A, But Crosman has a web page that list manufacture dates by serial number for Benjamin and Sheridan. (See the link below) when it opens scroll down to the Sheridan dates. (the first part is all Benjamin) Hopefully you have the serial number and can match the number with a date of manufacture.
Sheridan (Owned by Crosman) has made 4 variations of the C9 since 1995. A short history. Benjamin air rifles and Sheridan air rifles once were separate companies. Sheridan developed the C9 20 caliber series of rifles. Benjamin bought Sheridan and continued to make the C9 20 caliber series rifles. They also made a .177 and a .22 caliber C series rifle called a Benjamin. Crosman bought out Benjamin (in 1992) and decided to continue making the C series. With the name Sheridan on the .20 cal rifle and Benjamin on the .177 & .22 cal rifle some rifles also had the Crosman name on them. ( confused enough?) During all this confusion and name changing the C9A came along. I have 4 reference bluebooks on air guns and not one of them can give me a date for the C9A, But Crosman has a web page that list manufacture dates by serial number for Benjamin and Sheridan. (See the link below) when it opens scroll down to the Sheridan dates. (the first part is all Benjamin) Hopefully you have the serial number and can match the number with a date of manufacture.
This is possibly the most frustrating airguns to nail down as to the exact model. First of all let me explain. Sheridan was a standalone company. In 1977 Benjamin purchased Sheridan. Some guns were called Benjamin/Sheridan, in 1992 Crosman purchased Benjamin and Sheridan. They decided to call the .177 and .22 caliber rifles "Benjamin" and the .20 caliber rifle "Sheridan." But for awhile they were called "Benjamin/Sheridan." So now we have the models C, C9, CB9, C9PB, Along with Blue Streak and Silver Streak. Not to be confused with the Crosman/Benjamin "Super Streak." (Confused enough) Okay here is what I think your value is according to the Bluebook of airguns 9th edition. in very good condition it is worth between $105 to $135