> Gretsch called that kit Bop and the 20,12,14 Progressive. Nowadays, most do call the 18" bass set-up Bop though.
Dan - That's why I included a disclaimer in my post, Gretsch history and models is not one of my 'long-suits.' I'll defer to you on that one. I do love the drums though and the sizes is what 'makes it' for me.
DTF - You can tune a Gretsch 13" on the high end of the range, close your eyes and you'll hear a 12". Gretsch drums are really great that way. I think because of the die-cast hoops, tuning becomes easier and the tuning range of the drum is increased. Gretsch drums sound great tuned high/jazz, or low/rock,blues etc.
John