A very nicely customised 602, but not original... which as Fatboy404 says is not a bad thing, the factory stocks were often very soft wood and frequently split at the tang.

Its true that most ZKK's coming into Australia were fitted with a unique straight set trigger, with a conventional one supplied in a cloth bag with bolt take-down tool and an anti-rattle spring.

Most 602's I've seen however, have been fitted with the conventional trigger from new... and featured in the original ZKK brochure as such:

Note barrel band swivel and standard stock style set up for open sights on the LHS, with optional deluxe version with cheekpiece on the RHS.