Looks like a Command Block for the Redstone Update that was showcased at Minecon 2013!
This veteran cape is only for players who played before the 1.15 bug fix Buzzy Bees update!
Bettershading.
Only for players who played before 1.16, The Nether update. Gilded Blackstone Cape.
https://twitter.com/PopsRamjet/status/1128979747382452224
A few employees of Mojang Studios have this cape. This design has been used since July 25, 2021. It was made by Johan Aronson and it resembles the "Mojangs" or the "gadgets" that make up the Mojang Studios logo.[2] Users who own this cape are listed here.
Only for players who played before the 1.9 update! Made by Zozozrob.
akronman1 Millionth customer cape 1Millionth Cape Redone
From May 9 to May 13, 2013, all players of the Xbox 360 Edition were shown with this Birthday cape (except for players who were using skins that have their own cape) to celebrate the 1st birthday of the Xbox edition of Minecraft.[44][45] A Java Edition version of the cape does not exist. This cape was not added to their accounts.