In looking at the common Jefferson Nickel postings, I find a common 1941 (Philadelphia) which has no mintmark being advertised as rare because there is no mintmark and try to sell these items from hundreds of dollars to thousands of dollars. Most of these postings are from persons with 0 sells. It seems to me this is an attempt to "steal" money from some one who does know about the coin(s).

Deceptive (possible fraud) and Misleading advertising | Ask a Mentor

Deceptive (possible fraud) and Misleading advertising | Ask a Mentor | eBay Community