Keepsake

I keep a keepsake letter from my best friend in my wallet.

The letter she received became a keepsake of their long-distance friendship.

She cherishes the keepsake from her best friend.

The worn-out journal was a treasured keepsake of her best friend's final words.

He carries a keepsake in his wallet to remind him of his best friend.

The engraved keychain serves as a keepsake of their friendship.