The text reads:

Site of the Vicus Chorali (or Pilgrim) Press, on Pieterskerkchoorsteeg (St. Peter's Church, Choir Alley), Leyden, Netherlands, in the (1609-1620) home of the separatist Pilgrim Father, elder William Brewster of Scrooby, Nottinghamshire, England, the spiritual leader of Plymouth in New England until his death in 1643-44

The General Society of Mayflower Descendants (U.S.A., 1897)
Waldo Morgan Allen, Governor General
On their first pilgrimage—152, by planes—to the Netherlands and England
September 22 – October 6, 1955
335 years after the sailing of the Mayflower