Vintage Filigree Mother of Pearl (Mop) Silver Tone Necklace. 19in Chain.

Vintage filigree and mother of pearl (MOP) necklace. Silver tone. 19 inch chain. Definitely very old but not sure if it goes as far back as victorian or not. Very Unique. Even the chain is a bit unusual. Can't find any stamps on the pendant. Tarnished Check all photos.