From ArtSearch again. A collection of antique typefaces from their manuscripts. These two actually made me gasp.
From Francesco Torniello's treatise "L'Alfabeto" of 1517
Vespasiano Amphiarea, "Opera ... nelle quale s'insegna a scrivere...", Venice 1572.
Woodcuts. The horizontal lines help copying, and also emphasize that the letter-height is eight times the diameter of the main lines.
Thumbnails on the website all lead to larger images of each letter.