This exact Monaco was de-listed from an Antiquorum auction earlier this year, since it was a fake. Then, it was called an "early" dial but wore a late serial number, which was 262265. Now, it's a "test" dial, with a clearly recently- (and very poorly might I say) added 1 where the first 2 would be. Looks to me like somebody knows they have a fake on their hands, and is doing everything they can to deceive people and sell it for a very high price.

http://chronocentric.com/forums/heuer/index.cgi?md=read;id=75481