Jean, to my eyes both the keris posted by you as examples of possibly even luk keris are not in even the slightest degree able to be interpreted as other than a 7 luk keris and 13 luk keris when using the current convention of count.
The form of the point on the 13 luk is very usual for this style of blade and the 7 luk blade is simply not able to be counted as anything other than 7.
I do have a Pengging blade that could be counted as an even luk blade, because the final luk takes the point back towards the back of the blade, and the blade is not eroded to the degree where we could plead that this has been caused by the passage of time. However, the current convention of count (CCC) demands that the count finish on the same side that it started, ie, the gandhik side or front of the blade, so even where you cannot see any clear turn back to the front of the blade you are compelled to add the additional non-existent wave.
In the most simple of terms:- if we follow the CCC it is impossible to produce a luk count that gives us an even number. Just can't be done.
Incidentally, how long is the 7 luk keris?
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