The most complete coverage of the history of the 16 gauge Invincible was written up in the PGCA newsletter "Parker Pages" in the issue of the recent past. Much of the history of that gun had been covered before but Dietrich Apel added some important missing links to complete the story from date of manufacture to the present. I don't recall any mention of a South Carolina connection. The history of Invincible 12 gauge #200,000 has not been written about and is known by only a few live Parker collectors and researchers. The story of the later serial numbered 12 gauge, and the last to be discovered, was written up in a DGJ several years ago if I recall correctly. All three can be viewed at the National Firearms Museum in Oakton, VA. any day of the week, no admission charge.