This is Pyc Vintage , one of my favourite shops in Donosti, hands down.
A vintage paradise where I have found hundreds of treasurers throughout my life
When you look at it from the outside you could mistake it for a souvenir shop but doing so would be a big error... Go inside, pick a period and and ask to see their brooches , earrings, bracelets or necklaces... You will be surprised with the selection they have.
Once upon a time they used to be designers and makers and they still have stock from that time. I.e. you can buy unworn real vintage pieces... And other things too.