With the help of your replies so far I came at it from another way.
I typed "Barnett H. Abrahams" into Google and found :

  BARNETT HENRY ABRAHAMS
  London
  The business was established in c. 1866 by Marcus Newmark and
  Barnett Henry Abrahams.  The firm became Newmark, Abrahams &
  Goldshmidt (1871-1872), Barnett H. Abrahams (1885-1928) and
  Barnett H. Abrahams Ltd (1928- c. 1974).
  [ Ref. http://www.silvercollection.it/electroplatesilver.html 

I then found an entry in Yasni.com that would imply part of the
family went to the USA (I am in the U.K.) but I couldn't follow it.

So, there exists a possibility that, although they closed the Swiss
factory, they may well have continued in the UK.  I am now stuck.
Can anyone throw any further light in the subject?

Keith Howell