Hello -- I posted to this site once before but I didn't really have much information. I have learned a tiny bit more... I am interested to sell my Sigma DR-7. It is a Made in Japan 1970s model and I know virtually nothing about it except that it may be collectible.

The serial number is 74121588.

The headstock is different than any one i have seen... sideways M inlay, but no Sigma lettering underneath.

I have posted pictures...
Click Here