Possible Clues:

• It may be on a door
• Office door adornment
• Celebrity from China says they made the ship
• Does one attach handle to door?
• Panel team designed as sign of ownership
• A plaque to identify river, perhaps
• On which a person may be entitled to use a metal pen
• Specify coat that's to be put on the door
• Notice telling who is the occupant
• Office plaque