Nederlandse vlag naast KLM-toestel (c. 1949) by anonymous https://www.rawpixel.com/image/13757608/nederlandse-vlag-naast-klm-toestel-c-1949-anonymousFree Image from public domain licenseSpaarpot in de vorm van portret van Piet Lieftinck (1949) by LIWA https://www.rawpixel.com/image/13753420/spaarpot-vorm-van-portret-van-piet-lieftinck-1949-liwaFree Image from public domain license