Udo,
You may well be correct. However, I've seen similar plates refer to a particular unit and the individual sword number within that unit. Each person issued one of these swords had a numbered weapon. Many different groups were issued with these swords, including some police units, but not all used numbered examples. I'm on vacation at present, but when I get back I will check the book on Klewang and see if that abbreviation is mentioned. The crown over "Z" mark is likely an inspector's mark, which may help pin down the year of manufacture.
Ian
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