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It was made in 1974.
It's usually on the left side of the barrel just below the loading port.
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.
The Sheridan Silver streak air rifle was made from 1949 up to the 1990's after that it became the Blue Streak.
On the right side in front of the trigger
The serial number is on the left side of the loading port, in front of the model number. It may be under the black piece of rubber plastic.
If it is a "C9 silver Streak" it would be worth around $140. If it is a "C Silver Streak" it would be worth around $235
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.
This is for the Sliver Streak not the C9 silver streak. In good condition it is worth between $85- $105
what condition is the rifle in.
The Blue Streak has been in production from 1995 to present. If you want more Information I suggest you contact Crosman who owns both Benjamin and Sheridan. See the link below.
I've looked at every reference book I have and can not find a model Sheridan 63-90 Blue Streak. The Blue Streak, As far as I know, is CB9 not 63-90. On the CB9 the serial number is usually on the left side of the barrel just forward of the loading chamber. You may have to move the black rubber piece of plastic clip that covers the barrel.