noun
1. : an object of lasting interest or value (as an antique) suitable for or preserved in a museum
early pie plates, now museum pieces — American Guide Series: Connecticut
a museum piece volume — Claudia Cassidy
some classics, no longer appropriate for daily use, become … museum pieces periodically dusted off by the critics — Waldo Frank
2. : something antiquated or obsolete : a thing of the past
tended to regard the old clerk of court as a museum piece
the taxicabs … are early-century museum pieces — E.O.Hauser
contains the substance of lectures … which now are almost dated museum pieces — Irwin Edman