KerrisdaleGallery.com – stock ID#HR704sv-b – Green Red Yellow Abstract (untitled) by Roman Haller – 1975 original serigraph/silkscreen, signed in plate, one of 13 different serigraphs from “Künstlerkalendar ’75” , an oversized calendar featuring original serigraphs from 13 European artists, © 1975 Verlag F. Bruckmann KG, München (Bruckmann Publishing, Munich)