What is that thing?

[Tim Hickey <tjhickey@gatecity.com>]

On my 1973 TR6 restoration project there is a small metal tag that is pop
riveted to the left side of the windscreen frame on the inside.  It is
about midway up the side, and on top of the black trim piece. It is about
1.5 inches long, or so, and looks to me like someone has broken off the tag
(?) by bending it back and forth.
Was this a parts identification tag from the factory?  A VIN tag?  For the
life of me I can't see what function such a thing would serve.  Any ideas?

Thanks.