This has been in my power cord box since the early 80's when I had removed it from a trash-picked vacuum.
If I had not needed it for 40 years, I doubt I ever will.
I do not know the make, model, or style of vac it went in.
The rewind spring still retracts it and the cord looks okay.
If you know what it is and can use it, it is free - just pay the shipping via USPS from Plano TX, 75074.