This new numbering scheme was short-lived and was replaced only a few months later by an improved scheme that identifies an instrument’s country of origin and year of manufacture in the body of the serial number.
This new scheme uses the letters “MX” as a prefix to designate an instrument made in Mexico, followed by an eight-digit number.
Given the modular nature of Fender production techniques, an individual neck may have been produced in a given year, then stored for a period of time before being paired with a body to create a complete guitar, perhaps, for example, in the following year.
Therefore, while helpful in determining a of production dates, a neck date is obviously not a precisely definitive reference.
The “10” prefix was designed to identify the first year of the second decade of the new millennium, and while it appears on the instrument decals, it was not captured in Fender’s operating system.
Only the seven-digit suffixes were actually entered into the database.
The numbers for each year typically overlap, as there is always a transitional period between successive years and as necks that are made and serial numbered late in any given year are used on instruments assembled in the early months of the following year.
A new serial-numbering scheme was adopted toward the end of 2009 using the number “10” as a prefix, followed by a space, followed by seven digits.
To read this it is necessary to unscrew the neck from the body.So, obviously a neck date, while being helpful in providing a date range of production, cannot be a definitive reference.While there have been periods where dramatic changes have occurred, for example: the transition periods between Leo's Fender and the CBS years, as well as the transition between CBS' Fender and the current ownership, generally speaking, most models are feature specific and do not change from year to year..These serial numbers did not identify the country of origin in the body of the number.Instead, the instrument’s country of origin appears on the decal on the back of the headstock, near the serial number.