I have an old Telecom Gondola Phone from the 80s which according to someone I mentioned it to, thought it might be worth a few dollars.  I just keep it because I like the design (mine is brown) and it's a reminder of a frustrating encounter with Telstra and their dreadful service.  I can't imagine why anyone else would want it as it is pre digital, let alone pre wifi.

And that reminds me......it's not just old addresses that reappear on eBay.  So do old phone numbers.  Last year a seller included my phone number on the post label....only it was my old work number.  I had changed that on all my documentation (eBay PayPal etc) ages ago....before I retired in fact.  Sure enough when I checked, the number was back.  Had to change it again of course.  Weird.