Penguin Collectors Society

The quick answer:Generally anything with the word Penguin, Puffin or Pelican is a book published by Penguin; there are several different series within each of these brands. In addition the names Porpoise, Ptarmigan and Peregrine are also published by Penguin.

This is indeed a frequent question. The short answer is probably not. The main reason for this is that most titles were printed in very large numbers – often in editions of 30,000 to 50,000 - and it takes scarcity to create value.