I have now been able to check the source of the link that Alam Shah shared
It's seems to my eyes as if the article from CÚdric Le Dauphin is using the pictures from the old web site of D A Henkel on Peninsular Keris as illustration on the evolution of the Tajong?
BUT one hilt is then mislabeled and that's the one resembling mine which is dated 17th C at DA Henkel's site and 18th C in the article of Le Dauphin?
In the book Spirit of Wood it's dated pre 18th C.
I presume the change of dates is based on C Le Dauphin's own research and that he disagrees with the conclusions of D A Henkel, Nik Rashidin Nik Hussein as well as the authors of the book?
The article of Le Dauphin is very well written and impressive so I guess he has his reasons for changing the dating?