I've got a bit of Ourglass from '03. (bought new, from the Strathearn Gallery in Crieff)
The base is roughly ground with a small shiney deep patch.
The writing of Ourglass looks very, very similar.
The letters are formed the same way, with s's looking like snake shaped "s" typed ones, not normal cursive written ones of an upright slope with a loop coming down from it.
My vase has the initials P.T. after the date too.
I know nothing of them using a 4 pronged tool, I do not know if your bottle vase is consistent with their work. They are a brother and sister set-up.
