Marks on pair of candlesticks

I have spent the entire weekend, unsuccessfully trying to identify these marks. I am hoping someone with more experience can guide me in the right direction. Portugal, maybe?

Thank you very much in advance.

That is the city mark for Porto. Your P:ortugese idea was correct.


Paul - Obrigado!

But it is in fact sterling silver then?

That Porto mark was used from 1843-1853, when the grade of silver was 958/1000, which is the same as English Britannia Silver, sterling silver is 925/1000