More, better, pictures might help but I think it might be a Silver. However, the same thought that occurred to Drugolf also occurred to me. Tannoy did make non-DC woofers and this could be one of them, probably should be one of them given how it was being used. What's pushing me more toward thinking it's a Silver is the bit in the middle. To me it looks like a DC tweeter. (Better pictures might make me change my mind.)
Good luck. Great find.