Hello,
Your amp looks great however I do believe someone changed the grille cloth. My 1970 Sunn 2000S had "Fender" style gray/black grille cloth. My Sunn 200s was a 1969 and had diagonal style cloth, black and silver-gray. My 1968 Sceptre also had diagonal style. I have the 1969,1970,72,73,74 and 75 catalogs. Newer Sunn Equipment has all black grille cloth, amps have "RED" knobs. I mean no offense as Sunn is awesome gear. All I have left of Sunn is a First Gen 1973 Model T, Concert bass amp, and 2 Measly Sunn Coliseum amps, one is a bass other is a lead. and 3 Sunn 2x 15" cabs all with JBL K-140's, 2 are 215S one is the venerable 200s with diagonal grille cloth. Keep collecting and Rocking out. hARD TO GO WRONG WHEN YOU HAVE 4 6550A/KT88 TUBES.
PEACE