The Ibanez Mastercraft series was ,in fact , simply the Tama TC 10 and Tc 15 badge engineered as Ibanez Mastercraft . These guitars are all solid woods with the Kohno style 6. parallel struts ,a major cross brace,full length bridge patch and 2. further cross braces plus a horizontal closing bar.the second parallel strut from the treble end was considerably thicker than the other 5 struts and in addition passed over the closing bar at the bottom of the guitar.
The guitars were all similar including the earlier GA 10 and GA 15.--the 15.(top model) had Brazilian Jacaranda back and sides as opposed to Indian rosewood on the other models. All had specially selected solid spruce tops. Most ,but not all, had the double ebony insert at the back of the neck. All these guitars were quite heavy and had the typical Kohno "piano" sound which is quite distinct from the "Spanish" sound.
Ibanez took over Tama guitar production in the late 70's. when Tama was undergoing financial restructuring and acquired the Tama stock of fine tonewoods and no doubt some experienced personnel.
Mastercraft series also included the GA 500S and GA 600S which were essentially the same but did not have the double ebony neck insert,however some had a single ebony insert and others none.
The story then continued with the "Andorra" series which again were produced in 1977 for a short time starting with the 285 -2863 all with solid spruce tops but some with laminated rosewood back and sides All these had the Kohno style parallel bracing. (there was also a 2856-2857 models with a laminate top and 5. fan struts.) Now another series was produced in the mid late 80's namely the Andorra Recital and Conservatory series. This series reverted back to the earlier Spanish roots of Ibanez in that the guitars were made with a Spanish heel rather than the usual Japanese dovetail housing joint .Also the tops were of cedar- a Ramirez influence-- and the bracing was basically as the Ramirez with 6. fan struts and a slanting treble bar. This Recital series was the top model and designated GA 500S, GA 400S and GA 300S. All had specially selected solid cedar tops and laminated indian rosewood back and sides--the only difference between the 3. models was that the neck of the 300 was of "nato" rather than mahogany plus DX machine heads on the 500. model.
These guitars are very good indeed and some are arguably as good as a Ram.A1. ( A poor mans Ramirez! ) I have a particularly fine GA 300S.which has the best cedar top have ever seen and that includes several A1's. It is personally signed by Ryoji Matsuoka.
The Conservatory series GA 100 and GA120 are further designated with an"S" to distinguish whether a laminate or a solid top --"S" denotes solid. i.e. GA 120.S. The GA 100 models have laminate Mahogany back and sides and the GA 120 models all have laminate rosewood.
I have a 120.S. which again is a very good guitar indeed. certainly as good as a Ramirez student model . (I have had a Ramirez 400E.)
I have been a fan of the Andorra series for many years and over that time I have owned most of the models. I currently own 3, such. I have never never owned a Mastercraft series ,indeed I have never seen one advertised but I have had a Tama TC10. However I prefer my Andorra 300S.
Chopin used to sleep with wooden wedges between his fingers to increase their span--now there's a thought !