The Rare Book Detective: books, type, watermarks: 1570 Cross in diamond with saltire above
The Rare Book Detective: books, type, watermarks: 1622 Eucarist cross in tear drop
The Rare Book Detective: books, type, watermarks: 1622 Eucarist cross in tear drop with crown above
The Rare Book Detective: books, type, watermarks: 1625 partial cross in circle watermark in gutter