Yes, according to Herman Jansen there was no 100% Maltwine Genever (definitely not with the seal of Schiedam) available from 1962 or 1966 until 1986, when they launched Notaris. The Jenevermuseum followed that when they launched their Old Schiedam brand a few years later and then there was a long gap until Old Duff came along in 2017. There are now more 100% Maltwine Genevers (without the Seal) being made in Schiedam, and a good example is Onder de Boompjes. In fact there are a lot more 100% maltwine genevers being made and sold in Belgium than in Holland, and even France has a couple, my favorite being Wambrechies Pur Malt, which is strikingly similar to Old Schiedam. Incidentally, if your 100% Maltwine Genever is made in Schiedam and it “contributes materially to the advancement of heritage and the category”, it qualifies to carry a colorful little sticker certifying that it is a UNESCO Intangible Culturally Heritage product, as 100% Maltwine Genever from Schiedam is on the UNESCO register of intangible cultural history since about 2014. I made enquiries and the only brand that the Dutch-based certifying authority considers to qualify for that sticker is Old Schiedam, as it is part of the non-profit Jenevermuseum.
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