That looks like the same one which was on the eBay Australia site; a friend sent me the link and called it the "Tweetycam"!

Of course the yellow covering is not original. This model started life as the Zeiss Ikon Contessa S312, one of the Zeiss Ikon - Voigtlander models which was inherited by Rollei. It uses a battery which might be a little difficult to get, but I am sure we would all like to see how you get on with it.