Crosman owns both the Sheridan and Benjamin air gun line of products. Crosman has most all the owners and parts manuals online. You can search through them and find your model.
There are two models of the Blue Streak. The CB and the CB9
See the link below for the manuals.
Also there is a book "Blue book of airguns 9th edition" that has some more information in it.
what condition is the rifle in.
Model numbers from 025651 to 060550 were made in 1973. Your Sheridan rifle is 40 years old.
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
It was made in 1975. (Today Crosman owns Sheridan.) See the link below and then scroll down to "Sheridan"
Sheridan C silver streak in good condition would be worth between $125 -$160 USD
Around $100 in good condition.
The Sheridan Silver Streak is a 20 cal pump air rifle. To get an estimate of value please state the condition of the air rifle. Is it working? Is it in poor, fair, good, very good, or excellent condition.
Crosman corp took over Benjamin Sheardon a long time ago. Fortunately they offer manuals on almost all of their rifles that they have made. The Silver Streak is part of the "C9" series of rifles. Go towww.crosman.com and click on "Download a manual" and select the "Benjamin Sheardon" section of manuals. You will find your rifle there. see the related link
I assume that you are asking about the .20 cal Sheridan C Silver Streak NOT the C9 Silver streak. (It's worth more.) New in box: Excellent condition $185 Very Good $160 Good $120 This is just an estimate.
Your rifle was made in 1977. It's one of two models, here is how to determine which one is yours. Measure your rifle barrel Model CB Blue streak barrel is 19.5 inches. Model CB9 Blue streak barrel is 19.38 inches 36.75 overall. It also has a Monte Carlo stock ( cheek rest).
In order to give an estimate of value I need to know the current condition of the rifle.Excellent to poor ( Give it a rating?)
The Blue Book of Airguns has the info you need. Also, all Sheridan Streaks are .20 caliber, not .22 caliber.