When did Leo first start offering a rosewood fretboard, and why did he decide to do that? Was there a specific design goal Leo was trying to accomplish, or was it something else - like marketing? It would obviously cost more to manufacture, so to do something that cost more must have had a driver. I know we all debate the difference in tone between maple and rosewood, but was that really a factor in the late 50's/early 60's? I know it's bordering on heresy to say this, but I can barely detect a difference in tone (all other things being identical).