My Hot Rod and Custom Car Clubs book does list the Seacoasters from Ft. Bragg, so I'm guessing that club was around in the 40's, 50's or 60's. The author, Fred Thomas, researched a lot of old publications gathering info about old car clubs. Dennis O'Brien also has the original pattern for that plaque and that would also indicate the club was from that era ..... That's about all the info I can provide.