They are a fun and inexpensive thing to collect. I like the quaintness of them, and the variations in colour and shape. They belong to the traditional concept of teatime. Most of them have a lovely bee on the lid.
Two or three of them were bought new, but most of them are second-hand. None of them are all that old, but one of the oldest is the cream one with hollyhocks on in the second picture. That's one of my favourite ones.