For me, its one of two Heco Tinplate Models, either the WWI German Gunboat (photo below) or the WWII Hunkers JU52 (I have no photo):
I finally got a photo of a Heco Tinplate Models Junkers JU52 (alas, I was unable to obtain the models itself):
Ah, I see you bought it from someone Down Under.
It must be an iPhone thing because on my phone the original picture looks fine but when I look at it on a computer, it's down under, so to speak.