believe it or not, The major grading companies don't get it right either, some coins labeled SP or SMS have been found to have been identified DDO
business strikes by cherry pickers.
Aren't high quality business strikes more valuable than the SMS versions anyways?
What I look for
If it is a cameo or deep cameo, should be SMS.
Are the fields / device smoother or just good luster?
How are the rims? Sharp and squared?
On the reverse, how is the area where the shield meeting the tail feathers? Is it mushy? If mushy, lean towards business strike.
On the reverse, how is the banner with E PLURIBUS UNUM, again if mushy lean towards business strike.
Both where the shield meets the tail feathers and the EPU banner, it should be sharp delineation, BUT this could be a sharp business strike, and still not a guarantee.
You can also look for any of the DDO
, or varieties for that year and rule those out. If it is an identified variety as a business strike, it will rule it out from SMS. but as I said, sometimes business strikes are graded and slabbed SMS by the major TPGs. it's hard to tell with 100% certainty with non cameo SMS vs, early die state business strikes.