Irmãos Carvalho is a Porto-based specialist retailer in numismatics and coin collecting, operating through an online shop and a physical store in the city centre. The company offers coins and related collectibles from Portugal, the euro area, former Portuguese colonies and other countries. Its catalogue includes commemorative and circulating coins, gold coins, banknotes, coin sets and collector lots, alongside books, albums, cases, capsules and other materials for storing and supporting collections. Featured items range from historic Portuguese issues to international gold pieces, with new arrivals and selected promotions regularly presented.

The business also buys coins, subject to assessment and whether items are of interest to its collection. Collectors can register to receive email notifications when products in selected categories arrive. Irmãos Carvalho provides customer support, accepts online orders and offers worldwide shipping, as well as free collection at its Porto shop. The company describes its approach as focused on authentic pieces, transparent product descriptions and dependable service, serving both experienced numismatists and people looking to develop a collection.