Answer:
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away yet lust for me keeps me locked away.
I have six faces but not even one body connected 21 eyes in total but cannot see.
I am constantly overlooked by everyone but everyone has me.
I have a face and two hands, but I have no arms or legs. Six plus seven is one. What am I?
Keep doing me to avoid lens dryness