Bilbo Baggins' coat of mail, given to him by Thorin Oakenshield. After his adventure, Bilbo loaned the mail to the Michel Delving Mathom House. He retrieved it before leaving on his 111th birthday.
In Rivendell, Bilbo gave the mail to Frodo. It is not know whether
he took it into the West when he went with the Last Riding of the
Keepers of the Three.
The Lord of the Rings