A 1/12 scale model crane from the Hanger set in Aliens. It can be seen at various points in the movie in the background. To give a forced perspective the models to the rear of the set were smaller 1/12 scale, wereas the foreground models were 1/4 scale.
This one is about 12" long and 8" high.Although this side has more detail, albeit basic, it was not the side seen on screen.