Oyster Cards You've Never Heard Of

The Oyster Card is 20 years old! And there's a new limited edition card out for you to collect ... but do you know about all the other variants that have appeared over the years?
Official TfL Press Release: tfl-newsroom.p...
Regardless of the popularity of contactless bank cards, there will also be a need for those who will require an Oyster card to travel, and so I would expect that TfL will keep Oyster for the forseeble future.