bennyinkwell has posted a set of Birmingham postcards on Flickr. This very odd fish one is my favourite. He explains a bit more:
A set of old postcards with lift up flaps under which are a number of small photos of Birmingham. Most are by the ‘Valentines’ company and are usually a play on words. There are some quite bizzarre examples including a rat and a bloater! They also tend to be generic cards with ‘Birmingham’ printed on.