What price could you get for a 1970s el-gamo asi paratrooper air rifle in mint con?

It has taken me a long time to answer this question, because I can not find any information about the ASI paratrooper. Apparently is was sold in England and Canada. Today I accidentally found a page that referenced it as the ASI paratrooper/Gamo gamatic 85. When I saw the photo of the ASI and parts manual for the Gamatic 85 I realized that they were the same air rifle.

My Bluebooks give me the price guide for the Gamo Gamatic 85.

In Excellent condition it is worth around $65 USD and if you have the box you can add about 10%