Our scan shows the front of a typical card from the set, and also the reverse of another, all still in the original Cello-wrap so don’t worry about those two lines of pricing.  It is Hongkong Post’s Postage Prepaid Picture Card Series No. 80, whose pre-printed postage was valid for posting worldwide.  We have two unused sets:  one with no cancellation (Grade: 1, $16), and another with a special postmark (Grade: 1, $18).