The positioning of the "25" lettering isn't nearly as absolute in determining whether you are dealing with the real thing or a fake.
I bought a bottle of the Macallan 25 from a liquor store a while back, but it came in a red painted box instead of the pine box. Since I hadn't seen it before I e-mailed Macallan for more info.
They sent me this picture of the whisky as I had described it for identification.
As you can see, the bottom line of the 2 falls neatly in between the lines. Apparently, on later releases, the printing was aligned slighty differently. (It matches the printing on my bottle by the way, which was purchased by the liquor store from Macallan themselves.)
E-mail from The Macallan Distillery:
We stopped referring to our 25 years old as the Anniversary Malt in 2004 but the wooden Burgundy box was only in place for less than 2 years so I would suggest that your bottle was released in 2002/3. The year of distillation was removed a year or two before that as this conveyed that all the whisky contained therein was distilled in that year, whereas this was not always the case. There is frequently older whisky contained in the vatting.
I attach an image of what I think your bottle looks like. Assuming this is the correct packaging, then your bottle will contain whisky distilled in 1978 or before.
You do not have the required permissions to view the files attached to this post.