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Other physical indicators or attributes, such as finish, trim, tuners, etc., can help determine the approximate construction date of a particular example, but almost never exactly.
All other text was printed in black ink, or stamped on in ink by the manufacturer (model and serial numbers.) 5-digit, or 8-digit serial numbers. Being a mid-year change, some continued on with the "Purple" label, though with the new serial number designation preceded by an "S" or an "E" This is prefixed by the serial number assigned to the instrument and followed by an ink stamp of the model number. L-R as seen through the sound hole: Serial number, "Brand," Model number.) The serial numbers on these instruments were often preceded by the letters S or E; e.g. It is currently believed that this transition was complete by 1979.
In 1978-'79 the paper labels were discontinued and the inner back brace was "branded." Later Korean production show a resurgence in the paper label system for model and serial number, sometimes along with the brand.
These had an even fancier border.re: My own first Sigma, a DM12-5, which I purchased new in mid-1977 (I still have the receipt) had this second gen "Martin style" decal logo. Black binding (b/w/b/w/b.) Rosewood bridge (some 'ebonized') and fingerboard.
(See below for that explanation.) Some early 70s Sigma guitar serial numbers (c1972-1975) began with 7X0 suggesting the 197X build date (e.g. White binding on body (w/b/w/b/w.) "Ebonized" (blackened) Rosewood Bridge and fingerboard on some, natural rosewood on others.
750XXXXX possibly equates to a build year 1975.) These were eight digits long, the third digit always a place-holding 0, while all others by then were still only five digit serial numbers further adding to the confusion. and to this day remain the only Sigma related serial numbers that are publicly available.