This is an Orion #7706 Solar Filter that came with a used scope I purchased last year. It is reccomended for their Observer 70 and 80, and is designed to fit over a 4" OD tube. The filter is in good condition except for 4 neat holes (see photo) drilled in the side by the previous owner. He had atttached a temporary oversize ring to use it on a larger scope, and the holes do not affect the function of the filter. The glass and coatings are intact.
Orion lists this filter for $59.95, get this one for $25 plus $3 shipping.