I think that you can assume that it was written before the 20th Century, but with collected tunes it is really hard to tell.
Thanks for your info. I never knew the history of German people coming to live around Mudgee. That's really interesting. I find the pockets of cultural influences around Australia really fascinating, much more interesting than the "melting pot" concept (60's song?) of us all turning into "coffee coloured people", all looking, talking, acting, singing, dancing, eating the same.