In one-shot Guide to the Known Keys, there is a drawing by the youngest Locke, Bode, depicting a key that opens a door to actual reality, where he's not too impressed with 'weirdos' like series author Joe Hill and artist Gabriel Rodriguez.
Full-size licensed replica. Bright silver and gold-plated white metal with black enamel accents.
From Skelton Crew Studios. Sculpt by Arlen Pelletier.