Scale Model Equipment Co. signal

Another mystery for you today. I found this for 3 quid in the bargain bins at a show. It was bagged and boxed, but I was willing to pay the money simply to have a proper look at the thing.

Ostensibly scale, from base to the top of the post it's 5cm tall, which seems a bit short to me.

The arm is operated by a solenoid in the silver base which shoves a pin up to move the counterweight. This is working, returning the arm to danger when the pin drops. It still works when fed 16V AC from an H&M Duette.

The company, Scale Model Equipment, still exist. Set up in 1946 to manufacture models (the logo includes a train, but the one on the website is a car), in the 1950s they moved on to make arms for record players. A few years ago, they developed again to concentrate on " premium high quality precision engineered components". 

An interesting model, does anyone remember other items in the range?