Hi all I was just wondering if anyone knows anything about the slight differences between the old MK40 models, I'm talking about the the colourful model with the blue AM/PM sub dial ref 3520.53.00, I have bought two over the years, the one on the right is dated 1997 with a serial number starting with 55 and the one on the left is dated 2005 with a serial number starting with 58 As you can see I have changed the straps to preserve the originals. The differences are quite hard to tell at first glance but if you look close enough you'll notice this The minute markers on the older model on the right are smoother and flush while the newer model has obvious indents at every minute, also if you compare the numbers and text it is much more finely printed on the newer model on the left, but one of the differences that isn't as clear on the picture is that the sapphire glass on the newer model isn't as clear as the old one, it has a slightly cloudy look about it. As you can see from the original advertisement for the watch, the ad closer resembles my older model Is this a sign of a fake? or did omega make some slight adjustments to it's model before they finally stopped production? I hope there is someone out there that knows more about this watch, Thank you for reading and I look forward to hearing what you all have to say about the differences between these two watches, thanks again!