9 April – Treaty of amity, commerce and navigation with the Kingdom of Italy signed in Turin.[1]
12 May – Commercial treaty with the Netherlands, including Dutch agreement to perpetual abolition of tolls on the Scheldt river in return for a payment of 17 million guilders[2][3]
20 May – Commercial treaty with the United States, bringing relations into line with the free trade agreements already signed with France (1861), the United Kingdom (1862) and the Netherlands (1863).[4]
16 July – Multilateral treaty for the redemption of the Scheldt tolls signed in Brussels[5]
27 July – Commercial treaty with the Austrian Empire, bringing relations into line with the free trade agreements already signed with France (1861), the United Kingdom (1862) and the Netherlands (1863).[6]
1 August – Clipper Marnix van Sinte-Aldegonde the first ship to sail toll-free from Antwerp to the mouth of the Scheldt.[7]
^Olivier Keun (11 March 2013). "Afkoop Scheldetol 150 jaar". G/Geschiedenis (in Dutch). Archived from the original on 4 March 2016. Retrieved 8 September 2018.
^C. Pety de Thozée, Système commercial de la Belgique, vol. 2 (Brussels, Bruylant-Christophe, 1875), pp. 73-75. On Google Books
^C. Pety de Thozée, Système commercial de la Belgique, vol. 2 (Brussels, Bruylant-Christophe, 1875), p. 93. On Google Books
^Treaty between Austria, Brazil, Chile, Denmark, France, Great Britain, Hanover, Italy, Oldenburg, Peru, Portugal, Prussia, Russia, Spain, Sweden-Norway, Turkey and the Hanse Towns (Bremen, Hamburg and Lubeck), and Belgium, for the Redemption of the Scheldt Tolls, signed at Brussels, 16 July 1863. Oxford Historical Treaties onlineArchived 9 September 2018 at the Wayback Machine
^C. Pety de Thozée, Système commercial de la Belgique, vol. 2 (Brussels, Bruylant-Christophe, 1875), p. 99. On Google Books
^Olivier Keun (11 March 2013). "Afkoop Scheldetol 150 jaar". G/Geschiedenis (in Dutch). Archived from the original on 4 March 2016. Retrieved 8 September 2018.
^William Henry Overall, The dictionary of chronology, or historical and statistical register (London, 1870), p. 77.
^Nicolas Coupain, "The Pioneering Years (1863-1914)", in Kenneth Bertrams et al., Solvay: History of a Multinational Family Firm (Cambridge University Press, 2013), p. 22.