Hello All, The mint mark D has a doubling but the doubling is in blue. I was wondering if this was a legitimate doubling or if this was PMD? Thank you. Sent from my SM-G930T using Tapatalk
PMD - It's blue because the Zinc is exposed.. And then this happens http://www.error-ref.com/zinc-deterioration-on-lincoln-cents/ (I'm sharing this website and image from the website with you)