This Santos rosewood comes from leftover boards from a carpentry shop that closed over 50 years ago. We estimate that these boards are around 100 years old. The botanical species is Machaerium scleroxylon, not to be confused with Bolivian rosewood / Morado, which is a different wood whose botanical species is Libidibia ferrea, also known as Caesalpinia ferrea, closer to Brazilwood, while Machaerium scleroxylon is a close relative of Dalbergia.
Santos Rosewood grows mostly in Brazil. It has great acoustic properties, deep and strong basses with very balanced mids and trebles with a warm tone, like rosewood.