recessed neck plate

[headcrash]

I realized that some EBMM guitars have the recessed neckplate and some have not. Does anybody know, if there is a certain "rule" after which some have it or not?

 

[TonyEVH5150]

Here you go

http://www.ernieball.com/forums/music-man-guitars/216-neck-plate-variation.html

 

[headcrash]

ooops sorry, I should've searched more thoroughly first. Thanks !!!