An IS-6 "Black" skin from the PC version of the game.
Some pictures: https://imgur.com/a/JLOpV
Download the "normal" version (replaces the IS-6 skin) here.
Download the "legendary" version (replaces the IS-6's legendary camo) here.
Note that I don't actually own the IS-6, so if you run into any problems, please don't hesitate to report them. Thank you!
Edited by NWasabi, 07 November 2017 - 09:31 AM.