Suske en Wiske: Witte Zwanen Zwarte Zwanen [Albert Heijn reclame-uitgave]

This is a standalone promotional comic from 1987, published by Standaard Uitgeverij for the Albert Heijn supermarket chain. Written and drawn by Paul Geerts, the story features Suske en Wiske in a single-issue adventure titled "Witte Zwanen Zwarte Zwanen." It's a distinctive, commercially-commissioned entry in the long-running Belgian series, notable for its unique origin outside the regular album line.