Sources
Heyko Heyken, Die Weinkaufsprotokolle des Amtes Esens, Upstalsboom-Gesellschaft, Aurich [Germany], 1998.
Interpretation, insight, and translation come courtesy of Kay L. Blass (klblaas at t-online.de), who further acknowledges the interpretation and insight of Wiard Hinrichs.
For some further notes and records about family in this area, see Ruth Menssen’s excellent and comprehensive site at http://www.ortsfamilienbuecher.de/
More valuable information on Ostfriesland, Harlingerland, and the Esens area in this period (including some church and tax records) can also be found at http://www.genealogy.net/vereine/famfo-esens/deutsch/de-gen_dat.html