Dating ibanez jem guitars
Universe plate 912787 would denote a production year of 91 and the 2787th Universe built.
Universe number 250435 could be a 96′ UV7 green dot and the 435 indicates the 435th plate.
Factories – Shown as F for Fujigen in the examples above, other factories used that mainly produced the budget models were C for Cort (Korea), S for Samick (Korea), W for World (Korea), and guitars are also built in Indonesia, China, and who knows where else.
These serial numbers are usually quite different from the MIJ numbers, have many extra digits because of the enormous volume of guitars produced, and I am not familiar enough with any of them to tell you how to figure out the dating.
I’m not sure what year the changeover occurred but using the formula it will be easy for you to tell.
This is where you start seeing consecutive numbered plates on the remaining regular joint models that no longer indicate year.