A brief history of aluminum Christmas trees:
Aluminum trees were first manufactured in 1958 by the Aluminum Specialty Company. The trees consisted of a center pole with holes drilled in at an angle, to which branches covered in aluminum "needles" were attached. By placing the branches in the holes, a tree shape is formed.
The trees were in common usage until the late 1960s when they fell out of favour. Today, however, they are once again becoming popular with collectors. While a basic silver tree can be had for a low price, the rarer colours can go for hundreds of dollars.