Crosman air gun company owns Sheridan. Crosman offers a free service to locate shops that repair Crosman products. See the link below.
Sheridan air rifles who is owned by Crosman Sheridans are 5mm air rifles
What is the age of a Sheridan c series 5mm 20cal rifle serial number 370862
Your rifle can be aged based on its serial number. Please see the link below.
The Blue Book of Airguns has the info you need. Also, all Sheridan Streaks are .20 caliber, not .22 caliber.
I believe you are asking about a Sheridan .20 cal (5mm) air rifle. They started to make this rifle in 1949 and stopped in 1990 ( sheridan sliverstreak model ) During the 1990's the name changed to C9 sliverstreak and C9 bluestreak. The value is determined by the current condition of the rifle. You did not give any such information , therefor I can not answer you.
It depends on the model, but usually it is right on the barrel or the receiver. If it is really old it may not have a serial number. For a time Benjamin and Sheridan did not serialise their rifles.
You have given me all the information except the model. Sheridan has several different models at different prices
In order to give you an estimate of value, I need to know the current physical condition of the rifle. YOU need to give it some sort of rating like "Poor, Fair, Good, Very Good or Excellent condition." Without some rating it is not possible to answer you. Today Both Benjamin and Sheridan are owned by Crosman Air gun company.
There are 3 versions of the Sheridan Blue Streak. See the link below for the 2nd version. BTW today Crosman owns the Sheridan and Benjamin line of air guns. This link is from Crosman
Crosman owns the Sheridan line of air guns. They offer a service to locate shops that repair older products. See this link. http://www.crosman.com/general/find-a-service-center
The Sheridan Blue Streak air rifle uses a 5mm pellet. This is about .20 caliber- larger than the .177 pellet, smaller than the .22 pellet. I have been able to get these at Bass Pro Shop. There are also at least 3 lots of them for sale on Ebay right now. Only the 5mm/ .20 caliber pellets will work in your rifle- do not try to substitute anything else. P.S. Have had one for years. These are extremely good air rifles- very accurate, very powerful.
Sometime around 1980. In 1977 Benjamin bought out Sheridan and for a time they merged the names Benjamin/Sheridan.