Green, i don't believe that you actually have a separate gangya there. This is a kris from the latter part of the 20th Century (post WWII) and that is just an incised line in the blade meant to represent a gangya.
No, i would not say that you can date a blade based upon the absence or presence of this particular okir design. Not all blades carry such okir regardless of the age of the blade.
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