I agree there are very good Martins Pre 1970, Here's what I meant:
Bracing that was neither scalloped nor tapered was used 1949 to 1976.
Pre-April 1968: Maple bridge plate on all models. Rosewood bridge plates were used on all models starting with serial number 235586 afterward. These had a an unfortunate influence on the sound in my opinion. That said, there are very good guitars from that period but they are individually good, not necessarily collectively good.