from the late 60's i was privledged to acquire and play numerous manufaturer's acoustics and custom builts for rock stars without budgets, including 45 nashville darlin' (one of hank's) o, oo, ooo, all D & F, anything martin built from late 1800's till early 80's. from one serial number to the next sound is different, not just strings or player, my feeling was wood and how cared for and stored during life, and only playing can show difference. my '79 D 35 sounds side by side to my '32 D 45 except for look, pearl & shine of the 45, i like the 35 play/sound 1 notch better. play be 4 you pay, you can be surprised that a $1,500-$2,000 model plays /sounds better than $385,000 "collectible", unless resale is your thing.