I have gotten some confirmation from within Martin on the following:
Typos on the spec sheets – All instances of 2-3/16″ string spacing are incorrect.
All models with the High Performance taper have string spacing of 2-5/32″. The change was universal when they first made it. If you see 2-3/16″ on the spec sheet of a current model it is a typo. I saw at least three models listed that way in the past couple of days.
The new D-28 (2017) – it is NOT a typo that it has forward-shifted non-scalloped braces.
I had expected this makeover to go with scalloped bracing, as the D-18 had.
But after the sonic success of the GPC-28E, they decided to add forward-shifted bracing to the D-28, but keep the braces non-scalloped. I can’t wait to hear the results in person. I liked the sound of the GPC-28 a lot.
The GPC-28E, OMC-28E, 00-28, and soon to be released GP-28E and OM-28E are all moving to this new styling, with the aging toner and tortoise guard, antique white binding and mother of pearl dots of the new D-28. This decision came pretty late, so the latter two were not ready for the show.
The 00-28, and all OMs are retaining their scalloped 1/4″ bracing. But we can expect to see all large guitars made in Standard Style 28 to have non-scalloped bracing from now on.
I got a “probably soon” as to if the current OM-28 was going to lose the herringbone, short pattern diamond fret markers and grained ivoroid binding.
I got silence regarding the 000-28. But may learn something soon.
Likewise nothing on the HD-28, but I assume it is safe for now since the D-28 did not get scalloped bracing or herringbone.
The Jason Isbell model – spec clarification
Tim Teel confirmed this guitar has Golden Era style bracing and bridge plate – except it is rear-shifted. That is a first that I know of, unless someone has ordered customs like that. I bet it is a monster. Can’t wait to see and hear for myself.
It has High Gloss thin finish, not the Vintage Gloss of the Authentics. The spec sheet currently says “Gloss.”
That’s all for now.