In previous threads, it was first mentioned that there were 3 'elvira' issues, from 2000, 2001 & 2003.

Andy Hughes then clarified the differences and 'corrected' the 2001 issue to 2002.

HOWEVER...My original scan (unfortunately one side only) of the LE666 '26-0-23' issue dates back to January 2002, and I believe this is TCR9 V8539.
This would mean the chip had to be issued in 2001, and there was either no 2002 chip, or there is a 4th variety.

Can an expert please verify for certain? I got confused when preparing scans for my website - and it looks like everyone else did at some point in the past!!