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It was made in 1974.
It's usually on the left side of the barrel just below the loading port.
Sheridan silver is copper plated with silver.
Sheridan has somewhat of a murky past. The company started in 1945. The silver streak was made from 1949-1990. In 1972 Sheridan started serializing their air rifles, starting with #000000. in 1977 Benjamin air gun company bought out Sheridan. in 1992 Crosman bought out Benjamin. Today Crosman owns all three companies. So if your air rifles has a serial number, it was made after 1977. I found a list of serial numbers for Sheridan on the Crosman web site but they only go up to (#437801) that were made in 1985. So yours was made sometime after 1985.
The first Sheridan model C Silver Streak was called "The Sheridan" it was made from 1949 to 1990. After that it was called the C9 Silver Streak.
show me silver markings
Silver certificates don't always have a letter in the beginning of the serial number. They can have a star. Otherwise they all have letters.
The Sheridan Silver streak air rifle was made from 1949 up to the 1990's after that it became the Blue Streak.
around 70$
B27233123A
I'm not quite sure what you mean by BLOW BACK. The silver streak is not designed to "BLOW BACK" If it is then you may have a bad seal and it needs to be repaired. I suggest you contact Crosman ( they own Sheridan) Crosman has a home page and contact number at the bottom.
sheridan silver is usually made in niue. Every island trandition uses this special gift on every special occasion eg; weddings, birthdays and trditional haricutting ceremonies. Addition: it's definitely silver plate and not sterling silver.