American silver

I have a lovely spoon
At the back on the stem are the words
Copyright Henn& Haynes
but there is no reference to this maker that I can find

There is also the marks 925 over 1000
The word STERLING and an unsusual mark in a square cartouche with rounded edges but I can not get agood photo of it . I will keep trying
Any ideas about this please ??
silver Monday 23rd 014.jpg