First of all, thanks again to all who have supported my new addiction, I mean addition

, to my humble collection
Can I ask a follow up question, please?
Is the number of waves in an authentic kris supposedly odd and not even, or perhaps that is not necessarily the case?
Because in Herbert Krieger's (1926) description of krisses found in the now-Smithsonian Institute, per Krieger's textual description of five krisses, in fact three out of five have even-numbered waves.
Thanks in advance.