Well, my understanding of traditional East Jawa mendaks is that that they are generally plainer and not usually bejeweled.
I could be wrong, but i would place #18 as Jogyakarta.
Of course, the bottom line for our friend Athanase here is that no one is really currently making East Madura style mendaks and antique ones will cost quite a bit so he will probably be best off settling for a more available style of Javanese mendak which will in the end still look much better that what is currently in place.
