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Sigma-Martin USA guitars built in 1981 and 1982 only had specifically assigned serial numbers ranging from 900,001 to 902,908 (2,908 in total.) These serial numbers are documented by C.F. Martin & Co. and to this day remain the only Sigma-related serial numbers that are publicly available.
In 2010, Sigma recalled some lenses due to a "potential autofocus defect". Sigma offered customers a modification service, free of charge. Lenses requiring the modification were those with serial numbers between 10674301 and 10972000. Sigma lenses APO 50-500mm F4.5-6.3 DG OS HSM and APO 120-400mm F4.5-5.6 DG OS HSM were also affected. [2]
Tokai uses a seven-digit serial number usually pressed into the back of the headstock for the Gibson model replicas. Love Rocks use the first digit of the serial number for the year, 10XXXXX=1981 and starting in 1989 Love Rocks use the first two digits for the year, 89XXXXX=1989. Reborn models use only the first digit for the year, 800XXXX = 1978.
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Sigma Corporation (株式会社シグマ, Kabushiki-gaisha Shiguma) is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai , Fukushima , Japan .
Low numbers: 00000001 is most prized, but 00000002 to 00000100 are considered valuable. "Ladders": A sequential serial number, like 12345678 or 32109876. Palindromes: Say, 45288254 or 02100120.
A serial number is a unique identifier used to uniquely identify an item, and is usually assigned incrementally or sequentially. Despite being called serial "numbers", they do not need to be strictly numerical and may contain letters and other typographical symbols, or may consist entirely of a character string.