This atlas's existing falconet description dates the type to the sixteenth century. The cited Wikipedia Falconet (cannon) article, both in its lead and in the quoted Castelo de Sao Jorge museum display text, dates falcons and falconets to the end of the 14th century instead. The introduced-year fact was recorded as debated (1390, per the cited source) rather than silently overriding the standing description.
What would resolve this A specialist source on the history of early gunpowder artillery (for example Kelly DeVries and Robert Douglas Smith's work on medieval military technology, or a museum ordnance catalog) giving a specific dated example or clear consensus on when the falconet class was first cast, resolving whether the standing description or the Wikipedia dating is correct, or whether both a late-14th-century ancestor and a distinct 16th-century standardized type are being conflated under one name.
OpenHistory of artillery and gunpowder weaponsWikipedia: Falconet (cannon)