Blackware double-banded keros (a) with postfiring engraved "continuous volute" motif, AMNH Adolph Bandelier collection, B 2213, Ciriapata, Island of the Sun. (b) Omo style, Omo M16 site.
Isbell, William H.; Uribe, Mauricio I.; Tiballi, Anne; Edward P. Zegarra, 2018, "Visual database", https://doi.org/10.25346/S6/1B33FN.