This 1827 Capped Bust Half is the Square Base 2 variety and is die marriage O-117a, considered to be R4.  It is graded AU55 in a PCGS holder.  It has a very light patina over silvery and highly lustrous surfaces, where the cartwheels burst out under the light.  We consider this to be a A+ coin of a rare die marriage,  just an uber pq for the grade example for sure. 
 
This coin is approved by CAC.
 
PCGS Cert. #20885858