Plenty of enthusiasts for those here! Dating generally won't be precise as after the first Champions (late '30s, early '40s) design changes came slowly, but Brigham's second post in this thread
https://www.vintage-radio.net/forum/...d.php?t=130516
summarises some of the available info. Our Champions are having an easier life now we're in a flat with storage radiators, but they're still in work for local warmth when required, even (actually, especially) the somewhat lethal No.1 at the end of that old thread. I've no recent acquisitions except an apparently hardly used 92A still in its box.
Paul