The Mandalorian Helmet Lens!
https://www.snapchat.com/unlock/?type=SNAPCODE&uuid=19a6c048669f4cc5b21563d453dfe841&metadata=01
Ive seen a couple of these out there, but this one I've been trying to recreate from a digital build I intended to 3D Print. Trying to get the surfaces right where its not too glossy reflective and a bit grungy.