Mexican or spanish painting on copper around 300 years of ages. Not verified, however simply one appearance and you will be encouraged that this painting awaited a church someplace in Spain or Mexico. The caption reads "S. Marcelino" for Saint Marcelino who was a martyr for the faith. Spanish veneration for martyrs who met grisly fatalities was common till recently and genuine relics (like this one) from that duration still awaits churches.