Vintage concert-size Martin ukes are hard to find as the company didn't start offering them until 1925, barely two years before the ukulele craze took a serious downturn. This example is from the post-WWII period, when uke sales spiked up again for several years. It's apparently all-original and delivers a lot more volume and a deeper tone than Martin's smaller all-mahogany soprano models. There are three repaired (glued and cleated) cracks in the upper treble side bout of the back, hard to see unless you hold it to the light just so but photo 6 here shows the area. There's also a 2 inch hairline, and a pretty fine hair at that, to the lower bout of the treble side of the top, just below the horizontal scratch you can see in photo 10. plush lined chipboard case is later, probably 1970s or '80s.