Produced in Mexico by Licores Veracruz. The rum is bottled in small quantities and aged in white oak barrels (ex bourbon). There is more information on the bottle. Unfortunately other than the attached label it is all in Spanish!
Licores Veracruz have been trading as a going concern for 55 years but have only been exporting their products for 11 of those years. The Mocambo brand is imported into the United Kingdom by WSI LTD (Wine and Spirit International http://www.wineandspirit.com) who seem to import a number of unique products. The Mocambo 15 years is marketed as a premium rum.