I know I'll regret answering this question because there is so much confusion regarding this rifle.
Let me explain. At one time Sheridan, Benjamin and Crosman were 3 different companies. In 1977 Benjamin air gun company bought-out Sheridan and continued the Sheridan line. In 1992 Crosman air gun company bought-out Benjamin and kept both Benjamin and Sheridan lines going. Up until this time the serial numbering system was very poor for Sheridan. There is even confusion around the C, C9, C9A & C9PB as to when they were produced. Most Sheridan models were just marked "Sheridan" From 1949 to 1990 In 1972 serial numbering began with. #000000. As you can see yours had too many numbers to date it.
I Think yours was made sometime after 1990.
See the link below for dates of manufacture and you will see what I mean. Scroll down the page when it opens to the Sheridan section.
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