1801 – West Indian Porter is first brewed, which is a precursor to the modern day Guinness Foreign Extra Stout. 
1803 – The death of Arthur Guinness and the inheritance of the Brewing mantle to Arthur Guinness II
1811 – The first shipment of Guinness stout is made to Lisbon, Portugal.
1820s – Guinness is shipped to Guernsey, Barbados, Trinidad and Sierra Leone.
1821 – Arthur Guinness II sets down specific steps into brewing Guinness Extra Superior Porter
1824 – Guinness has now become known worldwide through an advertisement that appeared in a newspaper in Dublin for “Guinness’s East & West India Porter”.
1833 – Guinness survives the post-war recession becoming the largest brewery in Ireland, employing the most coopers.
1840 – Guinness is shipped to New York
1850s – Arthur Guinness II dies, passing on the brewery to his son, Sir Benjamin Lee Guinness.
1858 – Guinness is exported to New Zealand
1860s – First exports to South East Asia
1861 – The drink “Black Velvet” was born in London, England.
1862 – The trademark beer label is introduced. 
http://www.wirestrungharp.com/culture/guinness/harp_trademark.html
1869 – Marking 138 years, Guinness in Singapore does its first advertisement recorded.
1870 – 10% of all beer sales are now sold overseas
1876 – The Harp is registered as a trademark
1886 – The brewery becomes the first major brewery to become a public company on the London Stock Exchange. At present, it is the largest brewery in the world, having an annual production of 1.2 million barrels.
1889 – The first Guinness “World Traveller” made for the overseas markets in North and South America, Africa, Asia and Australia.
1890 – The Guinness and Iveagh Trusts is created, providing homes for the poor in Dublin and London, making substantial contributions to Trinity College Dublin and Dublin hospitals and landscaping St. Stephen’s Green to give as a gift to the public.
1893 – “T.B. Case becomes the first university science graduate to be employed at the Guinness brewery. It heralds the beginning of “scientific brewing” at St. James’ Gate.”
Guinness & Co. 