This is a vintage Wedgwood Peter Rabbit Mug, made in England.
Verse on mug reads "Once upon a time there were four little Rabbits, and
their names were Flopsy, Mopsy, Cotton Tail, and Peter", and "Now run
along and don't get into mischief". The pictures are adorable, including
one of Peter Rabbit inside the mug.
Excellent condition and would make a great baby gift.