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3D printed in smooth and slightly textured sterling silver hand-polished to a mild sheen.
This is a model of the key that was used during the Cold War for the dual-key launch system of Soviet ICBMs. They are a beautiful, and disturbing, piece of history. I built this model based on photos and measurements I found online of the actual keys that were recently auctioned. I printed my final model in polished silver, and it's very satisfying to hold.
This model has a solid core and will print in either plastic or metals.