Our Timbers are hot tonight, watch them boom the Thunder out of sight! Check out this NASL era Timbers tifo, as seen in the Phil Soar book Soccer: The World Game, published in 1978.
– Thanks to Aaron Cullen for the tip, photos.
Here’s an enlargement of the photo, which might be from the June 21st, 1975 match with the San Antonio Thunder. The caption says “Banner advertises its support for Portland Timbers”
San Antonio Thunder struggled in their inaugural 1975 season according to Michael Orr’s book, The 1975 Portland Timbers
The book, Soccer: The World Game – An Illustrated Guide to the World’s Fastest Growing Ball Game can still be found online for a pittance.