Charles Horner? 925 Stamped Art Nouveau Necklace Origin?

[Jen79]

Hello,
I am reasonably new to the forums & hope I am within the rules with these questions. I have a silver piece of jewellery which is stamped 925 with no other markings. It is very Charles Horner in appearance with an art nouveau style & Mother of Pearl inlay. I have found an identical (it is enamel not MOP) brooch on a search engine but the brooch has full hallmarks. My questions are, Would an item be stamped 925 but have no makers marks? Is 925 a more recent marking?
I have attached a link to the photos but wish I knew how to embed them for ease of viewing.
All efforts are greatly appreciated.
Regards
Jen
http://i1287.photobucket.com/albums/a62 ... 6e7a3a.jpg
http://i1287.photobucket.com/albums/a62 ... 900360.jpg
http://i1287.photobucket.com/albums/a62 ... c6683a.jpg