Swiveling Double Bit Key
This is a very unique
swiveling double bit key. I have never seen another like it and am not quite certain of its purpose. The key works by rotating the inner portion of the bow through a middle shaft connected to one of the bits that rotates out to complete the key. I presume it is possible the key was made as a safer means of having a double bit key. By allowing it to swivel, it would take up less space and the bits would be less subjected to wear and tear because they would be thicker and thus reinforced by the other bit. Ironically, if this is the intended purpose, it did not work as there is a minor break on the lower bit of one side.
Key unfolded showing both bits:
View of the other side of the key. Broken bit is visible.
View of how the key swivels. Key is partially turned in this picture: