Hard vinyl luggage tag with large rubber ring so it can be attached to the case handle of your machine. It contains space for your name, the machine's name, your personal details plus a bunch of fun things that you can record on it if you want to. This tag says 221K which indicates your machine is a black featherweight made in the USA - 221-1.
This tag can also be used for machines manufactured in the UK, just doesn't have the "K".