Originally Posted by Walter Gropius

Yeah I can see your point, but it would have to be three VERY similar fonts just for that one line of text along the bottom. Compare the three N's in that line with one another - they're too different to be the same font but surely too similar to be three different fonts... I'm not saying it's impossible, just highly unlikely that someone would have three fonts that are a) so similar to the main text and b) so similar to one another.

I would hazard a guess that someone has used a graphics tablet to manually copy the style of handwriting from the main bit.