There is a small spacer missing that sits on the end to hold the wire spaced away from the shaft." "I've not seen one quite like yours before, but that shape is typical of an oven rack puller/pusher." ...
"Electrochemically grown crystals. You can still see the holes used to hang the anodes in the plating bath. Towards the end of the solution's life, the polarity is reverted, so most or all dissolved ...