Hi nechesh,
I am on Alan's mailing list but thank you for adding his link! Unfortunately, Alan and Matt do not talk about the ages of these Keris.
I too have admired these Keris for some time. There is just "something" about these "proto-keris" that stir the imagination.

Maybe someone will enlighten us on the importance (no secrets) of these fascinating Keris and if they are being made in modern times for ceremonial use.
I have two old Keris, one that I believe is from the Majapahit period and the other is a little later. The consistency of the iron of these older Keris is a bit different. But I wanted to hear from the folks who are more knowledgeable...
I did not pay much for it and I did not expect much... and it exceeded my expectations. So yes, I like it a lot. Some day, I will cough up the funds for an old one.