Martin factory in Nazareth, Pa alongside the regular production line. These instruments were constructed using preformed and sometimes partially assembled imported parts, built or completed in the C.F. One Sigma DR-7 owner stated I have an old Sigma DR-7 Guitar.sn 6860.įurther, DR-7s with a four digit ink stamped label serial number and a zero fret strongly suggests a very early build date. ![]() However, while some models lasted the entire run from 1970 through 1983, others did not and were only offered for a limited number of years, so that most models construction dates can be narrowed down to a reasonable range. This may be due to them being built in several Japanese factories at the same time with no coordination in the serial numbering system. ![]() Later ones (c1972 onward) had white labels that had gold lettering with a border, often reddish-brown or purple in color.Īll other text was printed in black ink, or stamped on in ink by the manufacturer (model and serial numbers.). The earliest examples had a plain black on white inner paper label giving the model and serial numbers. The DM-5 and DR-7, as well as other early models continued to be built during this time as well.
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