Many thanks to this poster at ORCA known as Reel Geezer:
Arthur Sanford was a Presbyterian minister in Whitefish, MT c1915-1919 when he got interested in fishing reels and developed and patented an automatic reel with the spring power built into the rod handle. He moved to Vashon in 1919 and apparently developed that single action fly reel. The single action reel and the automatic reel are both shown in a Piper & Taft, Inc. (Seattle) catalog c1920. The automatic reel was advertised in the April 1920 issue of Outers Recreation magazine.
The single action reel was simply called the Springfisher Single Action Fly Reel. His automatic reel was labeled the Sanford's Springfisher Automatic Reel. Your reel came in four versions: 3" x 3/4" with solid or ventilated spool and 2-3/4" x 3/4" with solid or ventilated spool. I have seen and photographed a few of these single action reels, but am unaware of any of the automatic reels ever being found. Tom Harwood searched all around Vashon for information about Sanford, and for his reels, but found little information and so far as I know, he has not found an example of the automatic reel.