Sorry, no pics that show the decals, but here's a great portrait of Constante Girardengo on a track bike - what, 20s vintage?
http://bulgier.net/
It's from the Owen Mulholland article on Italian Campionissimi from Bicycle Guide magazine. The rest of the article is there too, scanned by Steve Kurt. Check it out, Mulholland is a fine writer and historian.
Mark Bulgier
Seattle, Wa
USA