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On typical Ibanez serial numbers the first 2 digits will indicate year, or the first digit will indicate the last digit of the year, but there are also some that indicate no year at all.
Because allot of it can be confusing I'll spell out as many model/serial types as I can remember tonight in a fully inconcise and dribble filled rant.
Where things go astray is when the Jem line went to AANJ in 93'.
This is where you start seeing consecutive numbered plates on the remaining regular joint models that no longer indicate year.
Prior to 11/2011 there are 5 digits followed by a letter.
The letter denotes year, starting in 2010 with A, with a 5 digit production number. Alphabet Production Month (A = January to L = December), Next two numbers are Production Year (09-2009. 5 is UV77REMC [2 is FRM1, etc], Next Two numbers is monthly series number.
A 7 digit number example - C5030567 - translates, 5 = 1995, 03 = 3rd month [March], 0567 = 567th guitar built in March 1995.
Plate numbers usually follow the pattern of the first 2 digits denoting year of production followed by a 4 digit number that denotes consecutive production for that model for that year, or consecutive production number for that particular model from the models inception.
160225 was a very odd plate number I came across on a Jem.