silk:
18.0cm long by 10.0cm deep

There is no woven credit on this silk, and it was probably intended to be mounted either as a picture or as a card.
However, Gillian has been able to authenticate this silk as being a Brough Nicholson & Hall manufacture, from ex-employees, in particular from a former weaver there, whose niece was her next-door-neighbour. In particular, he verified items that were un-named.