It was written in the NY Times in December 2004 that about 5% of NYPD officers (2000 of 30000) still carried the model 64 NY-1, which is a DAO stainless heavy barrel model 10. They were no longer being issued to new officers, but those who had them could still carry them until retirement. Wonder how many are still in service 5 years later? This is the link I found to this article, apparently the NYT doesn't have it available any more.
Interesting NY Times article on NYPD revolvers. - imfdb.org