Source: John Swan, Speculum Mundi, published in 1635
These are two more examples of wire watermarks, depicting a portion of one of two different watermarks that were used by the printer of this book. From what can be seen in these portions, the watermarks are apparently of vases holding flowers.
Additional Book Information
Speculum Mundi Or A Glasse Representing The Face Of The World, Shewing Both That It Did Begin, And Must Also End: The Manner How, And Time When, Being Largely Examined. Whereunto is joyned an Hexameron, or a serious discourse of the causes, continuance, and qualities of things in Nature; occasioned as matter pertinent to the work done in the six days of the Worlds creation. Aug, in Ser. de Ascen. Qui Se dicit scire quod nescit, temerarius est. Qui se negat scire quod scit, ingratus est. (Published at) Printed by the Printers to the Universitie of Cambridge. 1st Edition. 1635