The Norwegian Exchange FreiExchange has listed an Gulden – Bitcoin pair. https://freiexchange.com/market/NLG/BTC

FreiExchange is a modest exchange with around $100’000 daily traded volume. Currently they are listing older crypto projects dating back to 2014.: “They’ve suffered through thick and thin and are still committed and proven to be no scams.”

Most trades are free. Only a withdrawal fee applies. Please research their terms and conditions on these exact numbers.