Interesting. I've had several Martin Handcraft altos and tenors over the years and I now have both alto and tenor Lewin "Martins". I cannot find any difference in quality of build between these stencils and the "real mccoy". In fact the Lewins are better in the intonation dept., whereas I have had problems with this on previous Handcrafts. I'd go further and say that the tenor is one of the most in tune vintage tenors I've ever owned, and a real pleasure to play - I'm gigging it at the present time because I like it so much! I haven't owned a Martin soprano, but I borrowed a good condition 1927 example once, and found it had a lovely tone but the tuning wasn't it's strong point.