Hello Dave,
This is a savings stamp,named Manzhou double fish saving stamp.The Chinese character shown at the bottom is mean saving stamp,(ÓÊÕþ´¢½ðƱ£©£¬face value 1 Jiao(Ò¼½Ç),as the Chinese character shown at the top.The Chinese character is read from right to left.
The stamps is 1 set of 2.The picture is from interenet,the best ones I can find,sorry for the quality.The price is about CNY 190 for this 25 sets.

Hope this helps.

ZhangCheng