Sigma M ( Martin Guitar )
Stratocaster
Vintage 1970's 
3.600 kilogram
85% frets quality
1,8mm 11‘ string action
Made in Japan excellent quality
Black original color
This Stratocaster guitar is of excellent quality because it was manufactured when the famous C.F. Martin Company owned the Sigma company. 
Therefore, it is a guitar that is of a vintage 1969 1974 Fender USA level. 
It could have been manufactured in the famous Tokai factory. Several sites explain this stage of C.F. Martin Sigma guitar.
The Sigma M has a 3 way switch, but the positions 2 and 4 can be reached by "jamming" the selector switch in between positions.
It can be viewed and playing upon prior request at Guitars Cafe, rue de Bourg 11 in Lausanne, Switzerland
www.guitarscafe.com