Plantronics C65 DECT Cordless Headset
Plantronics M175/A Mobile Headset - Mono, corded with 2.5mm jack includes headband and over-ear hanger
Haven't been used for years but both working as far as I know.
Plantronics phone headsets (North Kelvinside G20)
This offer has been gifted to someone and is no longer available.