A Morgan dollar should weigh 26.73 grams
so unless it's very worn, that it lost a gram
of silver,
I'd say there is a good Chance you have a Counterfeit.
that is close though.
make sure your scale is accurate.
That is Not necessarily a bad thing to be counterfeit.
Allot depends on if it's an Old Historical Counterfeit,
or Chinese Knockoff
Sorry Not sure how to tell the Difference unless you can find a news article From the Past naming that date.
If it's a Very rare date, it's probably Chinese