The later classic Morgan dates can be challenging in higher grades, and have a bit of a checkered history. For years, some dates were considered rare, but the market shifted radically when entire bags of the dates emerged during the silver rush of the 1950s and early 1960s. (The 1904-O is a prime example.) Other dates existed in quantity in some of the more publicized hoards of dollars, such as the Redfield Hoard, though I do not believe an inventory was ever released.
The 1904 is readily available in all circulated grades, but starts to get pricey in mid-UNC grades.
What exists in the 1901-1904 Morgans is condition scarcity or rarity. Most are modestly priced below EF, start to escalate either in EF or AU, and are tough in UNC. The 1903-O is an exception, and is tough in any grade.
EDIT: It's not just the large and famous hoards of silver dollars that move the market. There are a lot of people who put away one or two bags of dollars during the silver rush. Some of those bags appear in estate sales, even very recently. I was in a coin show back east (St. Louis? Kansas City?) ten or twelve years ago, and somebody had just dumped a full bag of 1899-O Morgans into the market. Even though this was already a very common date, that many coins appearing at one time really whacked the market for a while.
Edited by fortcollins
04/25/2021 9:16 pm