Vintage Slingerland Radio King Gold Snare Drum Strainer

This is very rare Vintage Slingerland Radio King 3 point snare strainer in a gold finish, probably from the 20's to 30's. Not sure if the top t tension is original, but it is old. The bottom section has 2 threaded holes, not sure if they were added. No extension lever, but the threaded post is intact.