Sorry the pic is blurry.  I have two of these, this one is opened up as the dial is missing, and was investigating what I needed to do to fix it, the other is intact.  It has this tiny little window to see what the dial is at, and you need a flashlight to see it as it is not lit internally.  It has several multi pin Cannon jacks on it.  It is made by the Sparks-Withington company, and from its front panel and the electronics inside, thinking a VLF receiver, perhaps a monitor receiver for an old CAA  directional beacon.

Does anybody have an intact and reasonably priced URR35 receiver they would like to part with?

Charlie, W4MEC in NC