After WWII the 5th of May became a day of remembrance and celebration of the Liberation of the Netherlands. Every year on the 5th of May in those days a special exhibition was held which was accompanied by a special catalogue. Key elements in the cover were always the colours red , white and blue. The colors of the dutch national flag. Personally i think the HND EN MACHINE from 1957 is the very best of these publications. It has everything. A typical Sandberg design. the use of multiple sorts of paper , great printing quality and a spectacular cover, making this for me personally the best in the series.