The System II and III tremolo systems use a height adjustable locking nut.
But in the past, as we have already seen, the USA system has served only as a good starting point when dating a Fender USA instrument.
I have found the Fender Japan serial numbering system considerably more reliable (although, not perfect) for dating instruments... It was decided that the first serial numbers issued by Fender Japan would begin with the letters "JV." The JV was followed by 5 digits which have nothing to do with dating the guitar.
Most notably, production dates have been penciled or stamped on the butt end of the heel of the neck of most guitars and basses.
instrument production history, production dates have been applied to various components.
This guide explains the basic differences between Fender USA guitar serial numbering, and Fender Japan serial numbering.
If you already have a basic understanding of the USA serial numbering system, just skip down to the next Bold Centered Most readers of this are probably already aware that Fender USA guitar serial numbers "theoretically" follow a pattern.so, 1988); a Fender USA guitar serial starting "N4" would "theoretically" mean 1994 (N = in the Nineties, 4 = the 4th year... Additionally, Fender USA sometimes adds letters to the serial number to make special designations.so, 1994); a Fender USA guitar serial starting "Z3" would "theoretically" mean 2003 (Z = 2000, 3 = in the 3rd year... For example, the US Fender serial number DZ575xxxx, would designate a Deluxe (the "D") guitar made in 2005.While a "CRAFTED" In Japan guitar with a serial number starting with the letter "A" would have been made in 1997 or 1998.The Fender Japan serial numbering system is - on the face of it - a little more complex than the Fender USA system.The System III tremolo system was designed by John Page, Dan Smith, Charlie Gressett and John Carruthers. Sometimes parts of the tremolo system are lost and one common modification is to make the bridge function as a hardtail by locking the bridge into a non movable position and installing a string tree for the first and second strings so that the strings don't slip out of the nut slots.