That looks quite nice, front spoiler is unusual, the W124's had the step back in the centre section and the rear spoiler is also unusual.
I think this is a Japanese car which would explain it's low mileage (lots of these available in Japan with this kind of mileage - they were hugely expensive new due to punitive import duty).
It's a 560 SEC that's been dressed though, doesn't look like a factory AMG...
You can pick these up for around £4000 in Japan, I'd say this has probably come back courtesy of US armed forces
http://www.rakuten.co.jp/sk-network/