In the late 1950s, the main companies involved in the production and distribution of alcoholic spirits in Venezuela were grouped into one organization called Licorerias Unitas S.A. by the initiative of Seagrams who owned 51 % of the new entity until 1992. After a series of mergers and acquisitions involving Seagrams, Diageo, and Pernod Richard, a decision was made to divest in facilities and to instead concentrate on brand commercialization. The result was a group of local investors who purchased the manufacturing assets of Licorerias Unitas S.A. and formed Distilleries Unitas S.A. (DUSA) on August 22, 2002. Although this company is relatively new, the tradition of making quality rum in Venezuela using the these facilities which is not. In fact sugar cane has been cultivated in Venezuela perhaps as early as the 16th century. Systematic rum production in Venezuela can be dated to 1896.
Diplomatico Exclusiva Reserva is a premium rum which is produced from both column still rums and pot still rum. Within the blend are rums which are aged up to 12 years. The combination of tropical aging, batch still production yields an exquisite rum which has long been one of my favourites.
Here is a link to the review of the #24 spirit on my Rum Howler Top 100 Spirits Countdown of the best spirits I have ever tasted.
#24 – Diplomatico Reserva Exclusiva
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You may follow my Countdown list of the 100 Best Spirits here: The Rum Howler 2015 – Top 100 Spirits
Incidentally, the word “rhum” is the French spelling for our English word “rum”. However, the differences between Rhum and Rum are much deeper than just a twist in spelling. This is because the french traditions of making rhum in the French West Indies differs from the Spanish and English traditions of rum production in the rest of the Caribbean. A major difference in the production of agricole rhum is that it is distilled from fermented sugar cane juice rather than fermented molasses. As well rhum agricole is usually single distilled to 70 per cent alcohol by volume (ABV), and then brought to bottling proof (50 % ABV) after it is aged. These differences in production translate into a very different flavour profile, one that is more floral than molasses based rum.
In November 2012 I revisited the Appleton 12 year Old Rum and found that my appreciation of the rum had increased substantially. Another visit to the bottle this year only reinforced that opinion. The Appleton 12 Year Old XO Rum has improved over the years (or perhaps my taste has).
I am not sure exactly what happened to Oliver and Oliver as current information about their company is very hard to find. However, the 
The Renegade Rum Panama (Don Jose 1997) was first distilled in a column still, and then aged for ten years in Panama in used bourbon barrels. The rum was then shipped to Scotland for finishing in a Port pipe at the Bruichladdich Distillery. The Rum is bottled in the 700 ml squat decanter style bottle shown below at 46 percent alcohol by volume
The Rum Howler Blog 