This is a 1930s Martin Style O Sopranao Uke.  It has the original bar frets, friction tuners and decal label on the headstock.  It has an ebony nut and saddle, solid mahiogany top, back and sides.  Based on it's various characteristics, I'd date this to early 1930's perhaps 32-34 but Martin did not put serieal numbers on these back in the 30s so a precise date is difficult.
 
Martin Ukes have a classic sound all thier own.  This uke is in very good condition with no structural flaws.  It comes with a new hardshell uke case.