Frankly Fearn, this kind of ultra-specifoc information just isn't that important to me that i would be willing to allow even the slightest bit of damage to a keris or kris in my own collection. I consider them kinda like my children, not a commodity that i need to prove any authenticity in order to establish value on them. I personally would be less inclined to buy such a "damaged" piece even if it assured me of it's date of origin.
Are all my collection what i believe them to be. For the most part i think they are. I buy mostly from reputable people who tend to know what they are talking about. And most of all i buy a keris because i like it, not because of when it was made. That doesn't mean i don't like to know, but that knowledge is secondary. For me, art is art is art.....
.... just my 2¢ ....