Key of the Order of Letters

This key allowed access to the headquarters of the Men of Letters. It was described as the key to "every object, scroll, spell ever collected for thousands of years under one roof", as well as being the "supernatural mother lode".

Characteristics
The key is kept inside a small box with the Aquarian Star inscribed on it. It was small enough to be carried by Men of Letters and to be concealed from sight.

Location
In August 12, 1958, the key was held by Larry Ganem, who passed it on to Henry Winchester for protection from the demon Abaddon. Henry Winchester travelled to the future toward his blood relative and ended up in Sam and Dean's motel room in 2013. Unfortunately, Abaddon managed to follow Henry into the future. The Winchesters attempted to keep the demon from acquiring the key. They were successful, although the confrontation resulted into the death of Henry, the last surviving Men of Letter, and the temporary incapacitation of the Knight of Hell.

The brothers have since safeguarded the key to access the headquarters, which they used as their base of operations. They later lent the key to Kevin Tran to provide him safety from Crowley.

Appearances

 * Season 8
 * As Time Goes By 
 * Everybody Hates Hitler 
 * Sacrifice