Look a lot like a standard CTS-type "phenolic ring" cone tweeter, with a fancy aluminum faceplate/grill on it. If that's the case, not bad. Not state-of-the-art in any way, but a decent tweeter.
A closer photo of the tweeter (where we can see if there are indeed two solder rivets visible just under the tweeter cone) would probably tell all...
Regards,
Gordon.