The Modern Forgery Hypothesis

[Bluetoes101]

"In the manuscripts the diapering was used as an alternative to the gold ground primarily from the late 13th to 15th century, eventually replaced by the landscape background." - You are not allowed to view links. Register or Login to view.

On this page we see it in Apocalypse (Latin MS 19) "Date of Creation: Third quarter of the 14th century"
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Another example - Apocalypse Yates Thompson "Sometime between 1370 and 1390" (Bonus cloud line..)
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VMS examples

   

   

   

I don't know about heraldry enough to comment, but these patterns are pretty clear I think that they relate roughly to the carbon dating / supposed date of creation.