Well, if you
really don't want it, I'd love to add it to my collection
At Birmingham Dental Hospital where I trained, they used the variant shown at the very bottom of this page, with a rather pointless grey-painted section around the Recall button:
http://www.phone-pages.org.uk/stat.htm
They were all replaced in about 1997 (end of a 15 year contract, perhaps?), the old ones being unceremoniously chucked into a huge tub on wheels to await their fate. Obviously, it would have been rude not to grab a couple, so I did.
Nick.