A postal card on Chinese and Foreign Folklore series (中外民間傳說). This card is on the Parable of the Pipeline (管道的故事). Thanks Heihei.
An imprint stamp similar to the design of this card was found without face value at the back. However, it does indicated airmail postage has been paid. It was cancelled with a pictorial cancellation of Sha Tin Central (沙田中央) on 24.7.2015.