It's very hard to date a Sheridan rifle. Let me explain. Sheridan started in 1945 and produced single shot air rifles. In 1977 Benjamin air rifle bought Sheridan and continued the line. In 1992 Crosman bought Benjamin. And again kept both names in manufacture. They decided to use Sheridan on the 20 caliber rifles and Benjamin on the .177 and .22 caliber rifles and air guns. At one point you could find both names on the rifles. In 1995 they came out with the C9 Silver streak model which later added the CB9 Blue streak model. there have been 4 different variations of the Blue streak. It's still made today.
Crosman made some changes with their serial numbering system and I can't pinpoint your date of manufacture.
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