Probably nothing of any consequence, but this was attached to a magazine subscription originating in London that was received here in the US:

As it is the first time I've seen this particular label, I found it rather interesting. Since it looks as if it contains no bar code or QR code, it seems as though virtually anyone with a home computer or labeler could copy it.
Does anyone know if this is the sort of label that it commonly used now for magazine subscriptions?