19. For a comprehensive analysis of this coin group, see Roymans (2004) chapter 6. An association with the Batavi is also apparent from the distribution of most variants featuring additional marks. Heinrichs (2003) initially argued for an Ubian emission, but later qualified his position, adding that the Batavi – as well as the Ubii – could have been responsible: Heinrichs 2005, 184. See also Nick 2006, 45, who believes it is too early to draw conclusions from present distribution patterns.