Sometime around the mid 1970's.
New information 7/10/2014 The Hy Score model 806 is the same model as the Diana model 22 and the Winchester model 422. They were made between 1953 to 1985
What condition is it in, that determines the value.
Several companies made rifles for Hy-Score. Price values are all over the place on this Air-rifle. It all depends on whose name is on the actual rifle. I do believe that it was made by Diana, But that is just a guess. I highly suggest that you get a hold of the book "Bluebook of Airguns 9th edition" and go to the HY-Score section and start reading you have a lot of work to do to determine this value.
20-60 USD or so
I believe you are asking about a S&W 80G not 806. If I'm right it is a C02 BB rifle Brown Plastic stock. It has a sliding wedge level. If this is it, then it was made between 1972-80. In Fair to Good condition it is worth between $60-$80 in Excellent condition it is worth around $105 plus or minus.
1959
Depending on the year, its location will be either on the passengers side or toward the center away from the passengers side............
1932
What model. Its still in production.
HY-Score had several different companies making air guns for them under the HY-Score name. It's very difficult to answer this question without the model number or any description of the current condition of the rifle. So many companies made air guns for Hy-Score that current blue books don't carry very many listing in the crossover list for HY-Score. It is very possible that your rifle may have been made by Diana, Hammerli, BSF, EM-Ge, or Izhevsk Vostok. As for worth. WHAT CONDITION IS IT IN?
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It was made in 1975
It was made in 1978