Every few years (or at least they used to, don't know if they do anymore), Macanudo releases a vintage when they feel the wrapper crop that year was exceptional. Seems those you have are probably from the last time Mac used Jamaican tobacco. Later on that year, a hurricane hit Jamaica and put a serious hit on their tobacco industry.
Edit: I thought Macanudo moved out of Jamaica shortly after 1988, but from Gary's 2nd link, it seems they were still there in 1993.
Edit 2.0: Maybe that was right. From an article in CA from 1999:
Gore knows hurricanes all too well. In September 1988, Hurricane Gilbert slammed into Jamaica at full strength, maiming the nation's cigar industry. The storm destroyed Gore's factory in Kingston, which had stood since his grandfather James Frederick Gore founded Royal Jamaica in 1935, and ruined 1,000 acres of tobacco in May Pen. It was the worst natural disaster to befall Jamaica since the 1907 earthquake that turned Kingston into rubble. Because of Gilbert, the Jamaican tobacco industry was set back several years, production of Royal Jamaica cigars was shifted to the Dominican Republic, and Jamaican tobacco was no longer used in the island's biggest brand, Macanudo.
http://www.cigaraficionado.com/webfeatures/show/id/Jamaicas-Cigar-Comeback_7315