Thanks Bill @ GnS Eagle
This is the first year in which the U.S. Mint struck American Gold Eagles. The 1986 Uncirculated Gold Eagle is one of the more common issues as it has a very high mintage of over 912,000 coins struck. Only the 1998 and 1999 $5 Uncirculated Gold Eagles have higher mintages.
The 1989 $5 Uncirculated Gold Eagle tends to come with some minor spots or scratches especially if mishandled. Examples in MS69 are a little scarce and in perfect MS70 condition they are very scarce and much more difficult to find.