Antique 19th Century French Portieux Vallerysthal White Opaline Milk Glass Oil Lamp

A French Portieux / Vallerysthal white opaline milk glass oil lamp decorated with finned fish.
Dating from the 19th century but in great condition
The top of the chimney does have a nibble but this does not detract from the it’s overall display
Height 39cm
Base diameter 11cm
Funnel height 18cm
Centre diameter 10cm