MASTERS OF THE UNIVERSE SNAKE MOUNTAIN & Instruction Booklet Mattel 1983 VINTAGE. The item "MASTERS OF THE UNIVERSE SNAKE MOUNTAIN Complete Set in Box Mattel 1983 VINTAGE" is in sale since Sunday, September 30, 2018. This item is in the category "Toys & Hobbies\Action Figures\TV, Movie & Video Games". The seller is "corporaterod" and is located in Belleville, Illinois. This item can be shipped worldwide.