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The remaining four digits denote the instrument’s sequential number of manufacture among all the instruments made during the month indicated.

For example, serial number 07100091 indicates a guitar built in 2007 (07), in October of that year (10), and that it was the 91st guitar made that month (0091).

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By late ’72, the zero fret was being phased out and the saddle made non-adjustable, but still perched on a fixed bridge…

except on the 12-string DR-12-7 – a fact that plagued Martin sales reps, who were advised to “convert” dealers to the DM-12-5.

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.

Similarly, serial number 09050112 indicates the 112th guitar made during May 2009.

In mid/late 2012, US distributed Japanese-built guitars switched to the year designation that guitars distributed in Japan use.

The initial batches had a zero fret, covered truss-rod access, and bridges with a saddle “elevator.” Roughly 20 models were offered; the classical instruments had slot pegheads, while the acoustic flat-tops were characterized by a flat headstock reminiscent of a chef’s spatula (and now nicknamed as such), with the logo consisting of a gold decal of the word “Sigma” surmounted by the corresponding Greek letter (∑) in mother of pearl.

Some very early DR-7 and DM-5 batches had what collectors call an interior “type zero” white label with a black border and the Gen I logo printed with “Produced and distributed by C. Martin & Co., Nazareth, Pennsylvania, USA.” The model designation was usually hand-written in ink along the bottom border.

The numbers listed here show the LAST serial number produced for that year.

Martin produced all guitar serial number sequentially.

Seeking to compete in the market for budget-grade instruments, in 1970, Martin began importing acoustic guitars made by subcontractors in Japan.

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