Vintém 'R-P' – João III Porto mint

João III inherited a crown stretched thin by the costs of maintaining Portuguese India — Goa had fallen to Albuquerque in 1510, and the Estado da India was consuming silver faster than Atlantic trade could replenish it. The vintém, nominally worth 20 reais, was the workhorse of daily domestic exchange throughout his reign, produced at Lisbon, Porto, and the Évora mints simultaneously.

The 'R-P' designation identifies Porto mint production, with the reference spanning three distinct Gomes types reflecting successive die revisions across a reign of over three decades.