Does anyone have a reliable blazon for the arms of Pope Gregory XIV? I have prepared a version for free use on Wiki Commons based on this blazon:

1 and 4, Azure, a bend embattled counter-embattled between two estoiles Or; 2 and 3, Argent, a walnut tree eradicated and fructed proper. (From Notes and Queries, June 1882.)

Which produced this:

http://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/GregorioXIV.svg/350px-GregorioXIV.svg.png

However, most versions I’ve found are emblazoned like this:

http://static.tuttogratis.it/attualita/fotogallery/628X0/82001/gregorio-xiv.jpg

Obviously some significant differences. Is there an authority I can consult on this?

How about a contemporary source?

http://www.maremagnum.com/uploads/item_image/image/45/bolla-della-santita-gregorio-contra-a9916c5b-7258-41b5-a87e-8a294a77aa55.jpeg

See also http://bibliotecaestense.beniculturali.it/info/img/stemmihtml/sfondrati.html

Very helpful. Thanks!