26 Don Butler aka: Toneman 8 months ago After '61 "tone bars," aka parallel bracing, was the norm. Trestle bracing was the only "heavy stuff" and it only existed from late '57 to '61 and that's it. Before and after that, there was only parallel bracing under the tops. My 1962 Country Club has Trestle Bracing it's a thinline, 1 7/8" thick body.. I would think that 6122's from the same era would have Trestle's..