f. π1 is likely f. *12 which is folded back
The title on the engraved title page reads: Les oeuvres spirituelles de Thomas a Kempis auec les notes d'Horstius (f. π1 verso)
Different states. In some copies, the year in the imprint is mistakenly given as the unreadable 'M. DC. XCXIX'
: Bib. catholica Neerlandica impressa, 15992