Found in a Tauchnitz edition of Barry Pain's Stories in Grey (Leipzig 1912) this bookmark advertising an English tea room in Florence at 5 Piazza Strozzi. It served 'Light Luncheons, Home Made Bread' with 'Best Teas on sale as used in Tea Room.' It also provided English and American newspapers, a telephone and 'Writing Tables for use of customers' and may have flourished around 1920. The internet shows no trace of Miss Mackenzie's possibly short lived enterprise. Contemporary Baedeker's may mention it...The only clue is that the address was slightly later that of a publisher T de Marinis & Co who in 1925 published a book of reproductions of illuminated manuscripts with English text. It was published jointly with Bernard Quaritch of London.