A period piece is a play, book, or film that is set at a particular time in history and describes life at that time.
period piece in British English
noun
an object, a piece of music, a play, etc, valued for its quality of evoking a particular historical period: often one regarded as of little except historical interest
period piece in American English
1.
a painting, piece of furniture, novel, etc. considered typical of the period in which it was created; often, specif., one regarded as being of mere historical interest and without lasting artistic merit
2.
a novel, film, etc. set in an earlier time period, in which careful attention has been given to the details of its historical setting
Examples of 'period piece' in a sentence
period piece
The play is too unsentimental to feel like a period piece for long.