I like the bike as well, very clean and tight.

According to this site the frame making of van Tuyl during the end of the eighties/beginning of the nineties was done by Andrea Pesenti so it could be an Italian frame after all
http://www.klassiekeracefiets.info/2011/02/27/van-tuyl/

Gijs van Tuyl also build frames himself in his shop in Zaltbommel apparently.