Can anyone identify theses B&W speakers?

B&W, bowers and Wilkins, 

the tweeter on top is theirs, many models over the years.

Many models had flat tops, those you show are arched top and curved sides. Here is a stand mounted version, the ones you saw are a variation, must have been from the same time period

Nautilus 804 would be my guess.  could be 803s, they looked very similar.

803 more, 804 less and most likely not 703 due to arched top and free tweeter.

It’s either the 804 or 803 Nautilus or Nautilus S.  Compare the measurements — the 803 is bigger. 

The 803s look wider to me.  They were the same height but had bigger woofers and were wider.