A sealed letter is a variant of a letter, tattered letter or service letter that has a proof of authorship and integrity.
Seal impression and name of the sealer is shown in the item's tooltip.
Can be mailed.
Obtaining
Sealed Letters can be obtained by sealing a letter, tattered letter or service letter with a seal stamp.
Usage
Seal can be removed by holding the use button until a "seal ripping" animation is finished.
Removing the seal clears the authorship information and returns the item back to its original version.