Unique set of cufflinks. In back of each cufflink it is stamped "NB-PR" and has our Signature Diamond. "NB" is for "Natalio Barquet," the designer, and "PR" for "Puerto Rico. Natalio Barquet is a renown Cuban-Puerto Rican jeweler that has been in Old San Juan for over 40 years. All jewelry pieces are inspected prior to being sent out to our customers to ensure perfection and complete satisfaction. Coquí el Original is registered with the United States and Puerto Rico Patent and Trademark Office. We are a proud sponsor of the Puerto Rico Conservation Trust.