1916-S(OBV) WALKING LIBERTY

WHERE CAN I FIND THE STYLE OF S MINT MARKS USED ON 1916-S(OBV) WALKING LIBERTY HALF...........THANKS.
KEN.
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WHERE CAN I FIND THE STYLE OF S MINT MARKS USED ON 1916-S(OBV) WALKING LIBERTY HALF...........THANKS.
KEN.