Unidentified Antique Watch

I found this item in an antique store in New Zealand. The lady told me that the face of the watch is made of Paua shell which is an abalone found only in NZ. Other than that I have no idea where/when this watch is from or even what kind of watch it is (pocket, table?). On the face of the clock it has the labels "Europa" and beneath that "2 Jewels". On the case of the clock it says "Koha". Any leads on the time frame or origins of this watch would be appreciated.