I have taken a look. Easier if one can copy and manipulate images, which does not seem possible here, but having stood on my head, the size and manner of the impressed FB (is it an 8 rather than S?) suggests that it is a mould number. That is, it is for the shape of the vase, rather than a maker's initials. You may have a serendipity moment and find the same mould number with a maker's backstamp somewhere.
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