Looking at it some more I'm almost doubting the Russian relay, but not discounting it. Here's why...using CWOODREPLICAS photo I noticed that the contact closest to the edge was taller than the others to the left of it and the other contacts were not inline with the taller one. Not shown on my markup, I also noticed the two dry contacts on the far left on the other side of the threaded post seem to be fatter, shorter and almost conical towards the bottom than the Russian one.Cool theories. This is great info for everyone considering building this holster.
I'd say that the relays coming off of a Vickers - or similar RAF aircraft - is a solid guess. I came across this a few minutes ago (I might make an offer/pick it up over the weekend):A lot of parts seem to have come from the Vickers, so that certainly stands to reason.
That airframe and the Rolls Royce engines for the emitters as well as burner cans I’ve seen (not sure what you guys call them).
That's really close! It has most of the features I've seen on the original, including the magnet.