Signals

[Gizzy]

Whilst at Tony Green Steam Models on Sunday, I was looking at some of the items of the late Ian Stringer that they had for sale.

I saw these signals and I decided on an inpluse to buy them....

 

[Gizzy]

They have a nice brick base with a co-ax plug.

I guess these plugged into bases, but I couldn't see any.

Does anyone have any information on the manufacturer?

I am assuming these change aspect by reversing the supply polarity, so I will test later this week, but if anyone can share any knowledge on these, I'd be very grateful, thanks....