Well, it is a slide action, in .22 Rimfire Magnum. They were made from 1965 to about 1973. There was a Deluxe model. Value is around $100 in average condition and about $110 for the Deluxe. In new condition, the prices go to $165 and $210 respectively. That is about all the info I have, but Harley may have more.
Jim