This is actually a 5-7/8″ x 8-3/8″ ad card for the city of Jyväskylä, promoting “City of Light, Finland’s only event dedicated to urban lighting.”  Apparently it’s to compensate for the dark autumn season.  (Side comment, nothing to do with this postcard:  for urban lighting 24/7, come to Hong Kong …)  Mailed from Finland in 2013 with stamp, faint postmark, and Priority label.  Minor postal creasing for a card of this size.  Grade: 3