I don't recall having seen anything about this previously, but I may have missed it. PCGS just certified the first new 1795 Flowing Hair Half Dollar variety in the past century. It is now "O-133." Very interesting article about it here: https://coinweek.com/us-coins/pcgs-...ollar-variety-discovered-in-nearly-a-century/
The diagnostics are discussed in this thread https://www.cointalk.com/threads/new-variety-of-1795-half-dollar.362618/