Although these 5-7/8″ x 7-7/8″ items are not intended to be postcards, they could be used like that, and maybe some people did, since they were issued at the same time as the cards in our series just before this.  The idea was that people would wander through Central Market and collect “chops” on the reverse, showing that they saw the intended elements.  We have three of these cards.  Two are unmarked, and one has one chop from one of those stations.  Your choice.  By the way, the “DING” is capitalized because Hong Kong people often refer to trams as “Ding Ding” due to the sound they made.  Grade: 1