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This may be due to them being built in several Japanese factories at the same time with no coordination or tracking in the numbering system.
Martin & Co., based in Nazareth, Pennsylvania, created a line of inexpensive guitars in 1970 to compete with the increasing number of imported guitars from Japan and elsewhere. (Further detailed information is required here.) Serial Numbers Under the best of circumstances, Sigma serial numbers can only provide an indicator of the year in which a particular model was built. White binding on body (w/b/w/b/w.) "Ebonized" (blackened) Rosewood Bridge and fingerboard on some, natural rosewood on others.
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. Pearl/pearloid inlay position markers on fingerboard. Chrome closed back tuners (11:1 ratio.) The first year is known to have a zero fret. Truss rod adjustment location is on peg head at nut until 1980. 3 piece matched grain jacaranda back with marquetry.
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. 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.
The early 70s models (1970 -1975) can be distinguished by a more squared peghead, shaped similarly to that of a "spatula." The logo consisting of a gold decal with the single word in block lettering SIGMA surmounted with the Σ symbol (the Greek letter sigma), in mother of pearl.
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.
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.
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.
In 2011 the German company "AMI Musical Instruments Gmb H" purchased the rights to the name and relaunched Sigma Guitars again, this time being produced in China. The model and serial numbers were usually stamped on in ink, but some are known to have been hand-penned. These will have a 4, 5 or 8 digit (7*0XXXXX) serial number stamped or hand written on them. The 'Purple' label (c1972 onward): These are again white labels that had gold & black lettering but this time with a border, often pinkish-brown or violet in color. distributor is now Six String Brokerage LLC, Nazareth, Pa. 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.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. All known Sigma guitars have laminated sides and back wood. This is understandable since the Martin customer service department now responds to individual inquiries stating "all" Sigma's had laminate back/sides, while Sigma catalogs from the early 70s list the back/side wood as "Matched." (edit: "Matched" does not mean solid, but is a careful marketing nomenclature for laminate to confuse potential buyers.) In the 70's Sigma produced a line of guitars with model numbers starting with 52S, e.g., 52SDM-5, 52SDR-7 and 52SGCS-7. Laminated rosewood sides and 3-piece back with a contrasting (often highly figured) rosewood center strip. Chrome closed back tuners (11:1 ratio.) High gloss lacquer finish.52SDR-11 Dreadnought (c1972.) Solid spruce top. Gold plated closed back tuners (ratio unknown.) High gloss lacquer finish. While it was thought at one time that these were somehow 'special' and had solid tops, based on current research and scholarship, an emerging school of thought dismisses this notion. White binding on body (w/b/w/b/w.) Rosewood overlay on 1st generation "Spatula" headstock (Sigma w/Σ logo.) Headstock and fretboard are single-bound in white. Laminated rosewood sides and 3-piece back, ala' D35.
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". Black binding (b/w/b/w/b.) Rosewood bridge (some 'ebonized') and fingerboard.