1965 A RARE- NO MINT MARK Washington errors Quarter. Wrong Planchet on Obverse strike?

Eagle shows 2 extra tail feathers under 250X magnification. See pictures for other Details.

45% Clad cover missing on Obverse.
 
WHY RARE & COLLECTIBLE?? This year was supposed to have a MINT MARK.
 
Very worn and circulated. Thank you for your interest.