These piggy banks (original, without hole, cap or lock - otherwise they would not be in my collection) were listed as Dutch on the website for years, albeit with doubt. It is now clear to me that they are made in Germany. They are from the 1950s-60s and have mould number 791. The newer ones (from the 1970s) with hole or lock are by Scheurich and have number 792. My piggy banks have therefore been moved on the site to the GERMANY section.
Below: with lock by Scheurich, mould number 792.