Pamela - re your suggestion of 'salts' - whilst I see the connection you are making with Hoffmann INGRID - don't think I can agree the same for mine. I have many 'salts', picked up of the past few years, and they all have one thing in common - they are shallow, and these two u. pieces are not really the same. Wud have thought that 'salts' needed to be shallow in order to get at the salt. I suspect my pieces may remain a mystery, unless someone actually recognizes them.
However, as always thanks for your help and interest. Paul S.