What is the value of a daisy silver anniversary edition 880 gun excellent condtion?

It's hard to give you an answer to this question because none of my catalogues list this particular model of the 880. Daisy has made very many anniversary editions (IE. 1894 commemorative, Wells Fargo edition, Christmas story edition. so on and so on. However a model 880 in Excellent condition is worth around $65. I would add about $20 more for your edition.