Luis Santos. A student in Madrid of Juan Belén, Santos probably worked during a good part of the final quarter of the seventeenth century. Although his arms were superior, he was unfortunate in being the least outstanding of Belén's disciples. He taught his son, Juan Santos, and died in Madrid on 27 April 1721.
( From a History of SPANISH FIREARMS by James D. Lavin ).
BTW Richard, poinçon is more Frenchy; Spanish is punzon