Brompton 2-speed derailleur shifter

[Fastpedaller]

I'm about to advertise the 2-speed derailleur shifter from my 2007 superlight Brompton. Can anyone tell me when the shifter was changed to the one that attaches to the brake lever so I can describe it accurately?

 

[Fastpedaller]

Having searched for some while I've now found the change to different shifter (attached to brake lever) was 2017 onwards. How do I delete the now redundant thread?