Serial number coding for Mexican-made instruments is largely the same, except they will start with an M.The remaining digits are important for product identification, but the first few characters are all you need to determine the instruments age.The second character will usually be a number.For US instruments, the serial number will start with a letter. Serial dating is easiest for instruments made in the USA or Mexico, but is also possible for those made in Japan, Korea, China, and Indonesia.
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