"Uitwateringsluizen Bij Den Oever, Wieringen" Black and white post card photograph of the sluice gates at Den Oever, at the South-west end of the Afsluitdijk, Nederland, by J. Timmerman. This is the fourth in a set of ten cards within a 148 x 193 mm orange wrapper headed "Souvenir van de Zuiderzee-werken en Wieringermeer-polder" by J. Timmerman (see image at JOH/PC : 254), which could be sent separately or left in the wrapper as one item. It is und and unused. n.d.