All of those flat Flatirons had adjustable truss rods. All had spruce tops, no cedar. The difference between 1, 2 & 3 was wood and finish details.
#1 = Plainer woods, no binding or rosette, rosewood fingerboard
#2 = Fancier maple (koa was an option) binding but no rosette, ebony fingerboard
#3 = Same as 2 but had binding and rosette
I don't know all the letters but some are:
#MB = Birdseye maple
MC = Curly maple
N = Natural finish
#CH = "Chocolate" finish
# C = "Cherry" finish (I think)
# K = Koa
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