garrymartin said:
I was wondering that too, certainly no prototype I recognise, but I would guess it's German.
..to continue the guesswork.. it is definitely not German, both in terms of the front buffers, circular windows, wheel arrangement etc.. most likely it is one of these technical display locos built as an engineering exercise by apprentices or engineers at some engineering college and the engine may have had some support to allow free movement of the wheels in order to demonstrate the wheel-/ valve gear etc. ...there are loads of these type of engines sitting somewhere in Museums, vitrines etc... the downside is that most of them are built to some arbitrary scale so they are not compatible with most model railways... just waiting for another mantelpiece to sit on..

))