Replying to my own post.
I cleaned the silver and I'm pretty sure that the oblong hallmark is the weevil (see updated photos). This was mentioned in an earlier topic
http://www.925-1000.com/forum/viewtopic ... 106#p78106 which says:
"French import mark for silver called the Weevil. Silver items from French treaty countries were struck with the weevil in a rectangle mark, used 1893-1984. Fineness minimum .800. Treaty countries are those countries with which France had signed commercial customs treaties. ...The Netherlands was one."
Hallmarkwiki.com refers to the same mark as a flea and says when in a rectangle it is the 800 silver guarantee used for imports from 1893. So there is some consistency.
However, to my untrained eye the letters and picure in a lozenge does seem to fit the bill for the form of a French makers mark, so I am not sure how this would have been an import. I've looked at Dutch marks which bear no resemblance. I don't think there is any question about the letters, or that the picture is a fir tree or pine.
Grateful for any input from the expertise on this forum in identifying the maker's mark.
Laurie