Models such as the 52SDR-9, 52SDR-11, 52SDR-14 and 52SDR-15 DO have solid spruce tops and are considered the predecessors to the "Second Generation" models: Most Sigma guitars under the numerical model number 8 are wholly laminate bodies (exception is the DM-1ST.) The top wood is another matter entirely. Models designated "Second Generation" or in the "Marquis" series models had solid spruce tops and the cost reflected this upgrade as well, around 0 in USD more. White binding on body (w/b/w/b/w.) Rosewood overlay on peghead. Adjustable truss rod through peghead from 1970 through 1979. After 1980 truss rod adjustment is located internally and is accessed from soundhole.52SDR-9 Dreadnought (c1972.) Solid spruce top. "Snowflake" (more similar to a Maltese cross) pearl inlay position markers on fingerboard. Mother of pearl Hexagon & heptagon inlay position markers on fingerboard. White binding on body (w/b/w/b/w.) Peghead bound in white.
In 1978, model designations were added to capitalize on Martin model numbers: the DM-18, DM-19, DR-28, DR-28H, DR-35, DR-41, and DR-45. Pegheads & Logos Sigma guitars made in Japan from 1970 through 1983. The affixed warranty card was amended to read..."Your D-10 '9' (or D-10 '8') is not warranted against cosmetic defects." In the years of 1981 & 1982, Martin imported partially assembled Sigma guitars from Japan and the assembly was completed in Nazareth, Pennsylvania. rights to the Sigma brand name and trademark had been allowed to lapse by C. Louis Music of Missouri, AMI is not allowed to use the brand name "Sigma" in the U. Labels and Brands Sigma's made in Japan from 1970 through 1979 used a paper label to identify the model and serial number of the instrument. Some consider the DR-35N to be a prototype of the inexpensive laminate Martin Shenandoah line of guitars, it appears only 2907 of these Sigma Martin USA guitars were ever produced in total, though there may have been others that did not make final inspection and hence were not serialed (I personally know of one such Sigma-Martin,) and are the only Sigma related serial numbers publicly available from Martin at this time. prior to selling the brand to AMI, and had since been picked up by St. The sigma symbol is often described as a "sideways M."By the mid 1970's (c1976) the headstock logo design changed to utilize a gold "Martin style" decal stating "Sigma Guitars" in script with "Est. The headstock shape was also modified, to be more deeply tapered and shaped to resemble their Martin brethren. A Martin factory sales brochure shows the DR-28N retailed at 0.00 and the DR- 35N retailed at 0.00 The DR-35N had a 3-piece laminate rosewood back and sides and a solid spruce top. The peghead logo reads "Sigma Martin USA" and inside the sound box is on the neck block " made in USA" with Martin address etc.Some guitars made later in Taiwan and Indonesia have a different headstock shape and decal: The shape is more squared off at the top corners, while the decal states, "Sigma Guitars" on top with a miniature version of the "C. The paper labels for model/serial number identification had also changed again, this time with a fancy border and the word "Sigma" or "Sigma Guitars" printed in gold ink. The issue of whether or not Sigma guitars are solid wood or "plywood"laminate wood has been a source of controversy and confusion for many years now. It is widely assumed by owners and Sigma historians alike that this is correct, though C. Martin cannot, or will not confirm this."Sigma-Martin USA" guitars built in 19 only, had specifically assigned serial numbers ranging from 900,001 to 902,908 (2,907 in total.) These serial numbers are documented by C. These "N" instruments of which there were only two models ever produced, the DR-28N & DR-35N partially assembled in Japan and were imported to Nazareth ("N") and the Martin guitar factory as "kits".