The Old Duff is a game-changer indeed.
There’s a couple more 100% moutwijn genevers, although they’re unavailable in the US. The Bols is good and if you ever get the possibility, try and taste the Notaris. It’s made by Herman Jansen, the company that does Old Duff for Philip. They’re unique because they make their own malt wines - ironically, most malt wine used in Holland to produce genever is actually bought in Belgium (from Filliers).
It’s my understanding that the wars in the first half of the 20th century are largely to blame for the decline of 100% moutwijn genever - that, and the shift towards more neutral flavours. Interestingly, Myriam Hendrickx from Rutte says that the old-timers in Holland (70+ years old) are only drinking neutral grain spirit genever because that’s the style they first drunk when they were young men. According to Herman Jansen, there was no 100% moutwijn genever on the market from the mid-60’s to the mid-80’s, when they relaunched the style. I don’t know how accurate it is.
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