
The Seventh Key
Matthaeus Merian the Elder, engraver (text attributed to Basilius Valentinus)
Engraving, Late 17th century; text tradition traced to ca. 1599
from $55
Gold, the sun and the alchemist’s Great Work in eight surviving miniatures.
Its pieces are public-domain works, restored, and labelled with the institution that holds the original wherever one is known.