I bought an Otwin (round hole) from Ivor Mairants in about 1970 and still have it. Curiously the neck tapers so it is very slim for open chord shapes and gets slightly fatter as you go up the neck. I was very happy with it for several years. Incidentally. Ivor played it for me in his shop when I was trying out guitars; he was a great jazz player in his day and had recorded with Dick McDonagh ( not sure about spelling there), anyway, the Otwin is all right by me although I now use a Martin D41 and keep the Otwin stored away for sentimental reasons we need not go into here. The guitar I replaced the Otwin with was a Harmony Sovereign, another great guitar in it's day, and which is in the same cupboard as my Otwin.