In my experience of forty years of messing around with Martins, this is the first 00-18E that I've seen. I'm surprised to see that it's a very positive first impression, helped by the excellent setup. There were three models in this series, the 00-18E, the D-18E and the D-28E, with the 00 being the only one with a single pickup. The other two models ended up as ladder braced because of the location of the 2nd pu, while the 00 kept the standard X bracing, thus the only one with the fully acoustic "martin" sound. The pu is a D'Armand DynaSonic alnico single coil pickup, with DeArmond pots (Volume/Tone), and knobs. This one is actually in excellent condition sounds beautiful and has super fast action.