I can't be sure about it being Tremar but the glaze is very similar. I'm still prepared to bet it's Cornish. There is a mark which you can see in pics 9 and 10. It looks to have been there since it's manufacture because it is very smooth to the touch.

Brand: Shelf
Type: Vase
Product Type: Vases
Item Height: 8 inches
Item Length: 8 inches
Manufacturer/ Type: Tremar
Item Width: 8 inches