The MK models were custom designed by Michael Kasha (“MK”) and Richard Schneider when Schneider was Gibson’s Master Luthier and it was produced only in those four years. Kasha’s innovative bridge design has been subsequently adapted by other high end makers, such as Alvarez-Yairi and Breedlove.
In addition to the somewhat unusual shape, with a sloped shoulder body, a slightly wider lower bout (16 ¼”) than the dreadnought size, a narrowed waist for easier handling, and a 25 ½” scale, the MK-72 has a number of other special design features: modified fan-pattern bracing, an asymmetrical fan-shaped “Kasha” bridge to distribute string tension more effectively, a narrow 1920’s snakehead headstock with points at the upper corners, a beautiful 3-piece fret board of ebony/rosewood/ebony with abalone dot markers, a three-stripe rosewood sound hole cap, and an old style script logo (verified by Gruhn, p. 169). In other words, it will excite lots of interest when you take it out of its case, because nobody will have seen a Gibson like this before.
Overall, it’s 40 ¾” long—about standard dreadnought size, 11 ¾” at the upper bout, but only 10” at the waist; it tapers from 4 ¼” to a full 5” deep, which with the modified bracing enhances its booming bass register—kind of like a jumbo without the jumbo bulk and weight. While it may have been designed more for solo work than the blue grass stage, it still has enough carrying power for anybody and is an outstanding example of Gibson craftsmanship.