The chap I bought it from had it from new and is as came when he bought it he insists. He bought it new 20 years ago and has done no alterations whatsoever. Now you can see why I’m confused about it. Can you make any sense from the serial number my friend? Many thanks for replying by the way.
Since it is set up in the typical British fashion with the front brake on the right, it might be a European only edition that isn't listed in a catalog that anyone has made a copy of.
As for the serial number, it's in the incorrect style for a 2004 model, but with Cannondale that is not uncommon with them to do that. For example, my 2001 Jekyll has the serial number in the 93-99 style and a build date of late 1999 (KK= Nov 99) , despite the Jekyll's release for the 2001 model year. However, the first character of yours is totally confusing since it is a 4 The only thing I can make sense of is the frame size being a large.
Your guess is as good as mine when it comes to the build date. The crank and other drivetrain components do look period correct for a 2004 model. The first year of an Deore XT crank was 2004, and it looks like a FC-M760 model so it fits when the bike was purchased.
One thing to note is to get a fork boot over the bearing races ASAP on that Lefty! You can carefully install one without disassembling the fork. There is a
youtube video of how to do it and if you are careful it's very easy. The fork boot can be found at improvepart.com or sometime on Ebay, or if you are UK based like I am assuming then I've seen them on the for sale part of the retrobike.co.uk forums as well.