Jim Yates pointed out the fact that I omitted the D-21 from my list of (arguably) iconic/well known/often seen Martin dreads, for reasons touched upon below. For those that do not know, the D-21 in its original version could be described as a rosewood version of a D-18, with mostly the latter's appointments (slightly "plainer" than a D-28's, rosewood not ebony fingerboard and bridge) but otherwise equivalent materials to similar vintage D-28 (Brazilian rosewood back and sides in that era), for slightly less cost.

Martin did not produce a huge number (for some reason most purchasers were happy to pay a bit more for the D-28) but they were in production from 1955-1969 (original run) as compared with the D-28's 1931-present. I have never played one, but believe they sound as good as an equivalent D-28 of the same era (which is a good one), so my apologies for omitting it. Having said that, not many "heroes" seem to have played them, although I could be wrong; Jim Croce apparently toured with a borrowed one for a couple of years, and I have no reason to doubt that it sounded really good. The omission was really due to the fact that, despite being a bit of a "lazy guitar spotter" for some 50 years, they had not really infiltrated my consciousness very much, for which I apologise! Now of course they are fairly uncommon (by the standards of other Martins), and appreciated by buyers to be of similar quality to a D-28 of the same age, without quite the price tag (which is getting pretty high!).