Source: Il Petrarca, published in 1564
This is an example of a wire watermark. It consists of two circles, in the middle of which are three intersecting lines, forming what appears to be a six-poked wheel.
Additional Book Information
Il Petrarca Con Dichiarationi Non Piv Stampate. In Venetia, Appresso Nicolo Beuilacqua, 1564
