MS-64. The surfaces are quite smooth, but there are a number of light marks of Ms. liberty's cheek which preclude the MS-65 grade. The Greysheet says it's worth $83. You can add $10 to $15 to that for a retail price. With the MS-65 coin priced at $150, that is a fair sized jump. That is one of the reasons why I can't see this coin making that grade.
…be sure to check the VAM. Even if it is a common date or a common VAM, it’s fun to look up the particular attributes and know what it is…Spark
I took the flatness of the hair over the ear for light wear and was gonna say AU55-58, but I notice everybody else here so far says it's Mint State. So I suppose what I assumed was light rub was in fact related to the strike. I'm not a Morganite and definitely not a VAMpire. Nice looking coin, regardless. That at least I am qualified to speak on. Since the previous respondent goes by the username "Morgandude", I'll defer to him on this.
The flatness you see there is due to strike. Many Morgan Dollars are flat there. Some from the New Orleans mint are worse. The rest of the coin says Mint State.
1889 Philadelphia is a notoriously weak strike date for “P” mint Morgans. I thought of the possibility of it being a high AU grade coin, but since the lack of sharpness is uniform on both the obverse and reverse, and not only in the traditional high spots only, I would deem it a typical for date weak strike. Looks like the die was worn out badly, and probably at end of useful life. It is a mid grade MS coin.
FWIW - I see it as an MS62, but I am clueless about such things. It is the chatter on the obverse, especially the left field, that holds it down.