happy (belated) birthday amsterdam!

This morning I read in the Stadsdeel nieuws (a local community-type paper put out by the city, so not all that interesting) that it was Amsterdam's birthday yesterday. The first known written document in which the name 'Amsterdam' was recorded was written by Floris V, and set out toll priviledges for the city. It was dated 27 oktober 1275. What's that? Like 734 years? I don't think 734 is a very important birthday, since I didn't hear anything about it until this morning. I guess once you hit 730 you kind of keep quiet about it until you turn 750? Still a pretty flat city for being so far 'over the hill'.