"Bangka red bloods are defined by their pure locality. They are from the island province of Bangka off the east coast of Sumatra. Bangka bloods are known for there deep, dark reds, with amazing color contrasts of black and reds as adults. Keeping this locality pure in breeding programs is essential for their great color expressions." From solarserpents.com
So he is a brongersmai but is a specifically from a secluded island population.