When was the 177 calibur Smith and Wesson air rifle maufactured model number 806 This particular air rifle stands about 3 ft. tall has a stand to pirch on the ground for steadying your shot.?

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.