Chiang Kai-shek International Airport (also known as CKS) is 40 km west of Taipei.  This card originally had an informative stub on the left, not really meant for mailing, so there’s one perforated edge.  We also have one of these cards with the stub (see 30200455) but this one was mailed with two stamps, airmail sticker, and no postmark.  Grade: 4