In Central Park, there is still one example of the old seal of New York City, which looks like this:
from Seal and flag of the city of New York: authorized by the committee appointed by the mayor to commemorate the two hundred and fiftieth anniversary of the installation of the first mayor ... Edited by John B. Pine. In the public domain; on Google Books.
The relatively new seal bears the date 1625. You can see it on many municipal buildings, on wikipedia.com (copyright protected), and on NYC licenses.
Heraldists and historians: Why was the date changed? Do you know the answer?
Do you know where the old seal appears in Central Park?
Post here -- and stay tuned for a great story.