So I decided to create a post where I can pile up medieval examples of such dotted stars.
Let's start with couple of 'starry' flowers from Pseudo-Apuleius herbals. The Hague, MMW, 10 D 7 is 10th century French manuscript ( visit here ) and Ashmole 1462 is 12th century England ( visit here ).
visit here ) - second half of the 13th century, N. France or S. Netherlands.
Next, few dotted stars from England 1460-1500 illustrating a poem about the establishing of the Carthusian order from the British Library Add MS 37049 ( visit here ).
Dotted stars are decorating the outfits of the members of the Order of the Star, 1375-1379 France,
Paris Bibliothèque nationale de France MSS Français 2813 ( visit here ).
Aristotle explaining the effects of celestial bodies on plants, the British Library, Add MS 47680, dated 1326-1327, England ( visit here ).
We see a dotted star next to Solomon in 1455/58 German Biblia pauperum, Universitätsbibliothek Heidelberg, Cod. Pal. germ. 438 ( visit here ).
Codex Manesse (written between 1300-1340) Cod. Pal. germ. 848 (visit here ) contains a drawing of seven-point stars with dot in the center on the coat of arms of person named von Trostberg and on the page dedicated to Kristan von Hamle.
Coat of arms picturing a star with a dot in the center can be seen in Chronik des Konstanzer Konzils (written between 1414-1422, XVI.A.17, National Library of the Czech Republic, visit here ). The star belongs to Her Johannes Luti of Constance.
In short, dotted stars can be found in different contexts all over Western Europe, so they are not much help in solving the puzzle.
Winchester Cathedral floor tile. I'm not sure how old is this star.
c1284-1316 the Alphonso Psalter, British Library, Add MS 24686
12th century, Vendome, Bibl. Mun. MS 0117
Astronomical manuscript, the Paul Getty Museum, English, 13th-15th century, MS Ludwig XII 5 ( visit here )
Notebook of Thomas Betson of Syon Abbey, 15th century, St John's College, Cambridge, MS E.6 ( visit here ).
St John's College, Cambridge, MS K.21, English, 13th -14th century ( visit here )
The Hague, MMW 10 C 20, Germany, c 1475-1500 ( visit here )
The Hague, RMMW, 10 C 23, 15th century, Germany, ( visit here )
Zurich, Zentral Bibliothek, MS C 101 ( here ), 15th century, wandering monk Gall Kemli, in Latin and German
David Suter reminded me about the stars by Albrecht Durer, so I picked a few from woodcuts - end of 15th - early 16th century
Cheryl Lynn Helm suggested the dotted stars in the Babylonian astrology and although they are far from medieval I'll include them for those interested.