1962 was the year the US first sold special Christmas stamps.
Not sure what you may have, as the US did not issue a Christmas Stamp in the year 2000.
1964
1962
The first commercial Christmas card was made in 1843
The first Christmas stamp was issued in 1961 according to the postal service's website, and they have continued with them ever since. http://www.usps.com/news/2002/philatelic/sr02_078.htm
1889
I do not know how to show you a picture, but this stamp was a small size stamp, and pictured a wreath in green with a large red bow at the bottom. There are 3 green candles at the left of the wreath and the denomination of the stamp of 4 cents. There is a picture of it on the attached link.
{| |- | Scott Number 1205. The stamp was issued for the Christman season in 1962. It pictured a wreath and some candles. There have been Seasonal issues ever since, usually one the has a religious them and one that has a holiday theme. |}
1916. Merry christmas
First class US postage in 1962 was 4 cents. Here's a great website showing postage prices in different years.
John Horsely made the first Christmas card in London, England, in the year 1843.