I think it should have an oval overfinch badge on the tailgate.
I agree, I think its a fake, I could fit a crappy wood finish and say mines an overfinch.
Unless the seller has full proof, with receipts and paperwork, which there would be if it had really been an overfinch vehicle, I wouldnt believe that its real.
Also I'd do some quick research, this day and age overfinch do hundreds of range rover conversions, but back then it seemed less common, from what ive found they only did the odd range rover to mark Anniversaries. Year 2000, no mention of a 2001
This is what it states online:
1986 - Overfinch 570 S (Sport) with GM 700 four-speed automatic transmission
1987 - further development on 570 Sport
1988 - Overfinch 500 E, 500 S
1989 - Overfinch 570 S2
1990 - Overfinch 500i and 570 TPi
1991 - Overfinch 570 Ti
1993 - 10th Anniversary 500i and 570Ti built to celebrate 10 years of GM-engined Range Rover production
1998 - Overfinch 460i engine conversion for Classic Range Rover, Discovery and new SV 50 Land Rover
2000 - Overfinch 630R Anniversary model (to celebrate companys 25th year)
2003 - Overfinch 580 S [9][10]
Current - Overfinch Vogue GT (based on Range Rover), Overfinch SuperSport (based on Range Rover Sport) [11], and Holland & Holland Overfinch [12]
(I could be talking total crap, but a quick look on wiki, and overfinch website shows a few details)
Hope this helps.