I just restored in working condition my father's Ericsson T10s! It has a custom black shell (hence the “T10sc” label) and it's certainly used, but in very fair condition for its age. :
Ericsson t10
Ericsson T28 - Wikipedia
File:Ericsson T10s.jpg - Wikimedia Commons
ERICSSON T10s Specification - IMEI.info
Ericsson T10s - YouTube
Ericsson t10
Ericsson T10s - Full phone specifications
Sony Ericsson t10 s plus klawiatura Szczecin - Sprzedajemy.pl