Not sure what you may have, as the US did not issue a Christmas Stamp in the year 2000.
About a $1.
It is called the First Day of Issue. Cancellations on that date have value. Cancellations before that date are really sought after!
The value of a first day of issue gold stamp from Lansing, Michigan, dated April 4, 2002, can vary based on its condition, demand among collectors, and the specific design of the stamp. Typically, modern first day issue stamps may not hold significant monetary value, often ranging from a few dollars to around $20. For a more precise valuation, it's advisable to consult a stamp catalog or a professional stamp dealer.
4 cents
In perfect condition it is worth 25 cents.
Scott US#1270If it is a first day of issue, it should have a cancellation. A First Day Cover is likely to be worth about a dollar. Without the cancellation it is worth the same as a used stamp, about 15 cents.
First issue? I think you mean mint - which means it's unused. Many factors are involved in pricing the stamp: what country, condition of the stamp, which particular stamp (more than one stamp was issued in 1973) and whether it is new or used. Without more details it is not possible to answer your question properly.
The value of a 1989 Ernest Hemingway first day issue stamp can vary based on factors such as condition, rarity, and demand among collectors. Generally, it may range from a couple of dollars to around $20. It's best to consult a stamp collector or appraiser for a more accurate valuation.
That would be US Scott Number 2417. A First Day Cover has a catalog value of $4.
That is Scott Number 2967. It has a minimal value and can be purchased for about $3.
25 cents.