Help with marks in porcelain pottery

[cardezo]

Hello, all:

I have a tea set for six in color green and gold and there is only only plate with a mark I think is "PB". The rest of the set has tree wavy lines and a mark I cannot distinguish. I was looking on internet for this mark but with no success. I can figure out with the "PB" and the lines that it could be "Porcelanas Bidasoa", nevertheless I haven't found this style on their collection. Any help with the identification?

Thanks in advance.

Alberto