[David]

Johan, it is indeed quite possible that your pendokok could be gilded or have a gold wash, probably over brass. This is certainly not uncommon for such things.
I would say that it is highly unlikely it is solid gold.
On the meaning of the number of luks, i would say finding a definitive answer there might prove frustrating. Certainly different numbers luks were assigned different meanings or purpose, but from my studies those meanings shift from culture to culture and era to era. So what a 7-luk keris meant to a Bugis from Riau in the 19th century may not be the same as for a Javanese man in the 17th century, and so on.