Original Photograph of Steam Engine

This is a photograph (not a print) of what at that time was a brand new engine. It comes in its original frame. I have no idea how old it is, but the frame suggests it has a good age to it. The person I bought it from explained to me what kind of engine it was, etc. I wrote it all down at the time, but after weeks of searching for the piece of paper, I have now given up and am selling it as simply a steam engine. If I should come across the piece of paper again, I will send it on. Whoever buys this will have to do their own research. It has L 748 written on it. This presumably is the engine model.  Dimensions: 40 cm by 17.5 cm inclusive of the frame. Please add R27 for postage.