Deisel Crane pt 2

I supposed I have finished it but I keep looking at it and thinking something is not right. It is out of period with these cranes not being built until the late 1950's. However I saw this on as part of a dockyard scene for a WW2 game and it seemed to fit.

Unfortunately  I don't have the reference for where I got the image, so  I apologise if its yours and I am certainly not claiming it as mine.