A postcard with a cat. This card was issued by MoMoMo Card (陌墨Mo Card). Thanks xiaobaicc.
It was sent inside an envelope. Postage paid labels were used to send this envelope. Two labels were printed, one with 5 Yuan and the other 1 Yuan. Probably the postal clerk miscalculated the postage at the first place. They were printed at Hangzhou Zhongshanzhonglu 4 (杭州 中山中路 4) on 3.11.2012. The code for this post office is 浙AA85.