Maybe try: https://www.cointalk.com/threads/peculiar-1928-sa-gold-sovereign-any-ideas.151865/ https://www.ngccoin.com/news/article/3382/Counterfeit-Sovereigns/ good reads: https://www.silverstackers.com/forums/index.php?threads/weird-mintmark-on-sovereign.26184/ https://www.silverstackers.com/forums/index.php?threads/jewellers-copy-sovereign.21728/ https://www.silverstackers.com/forums/index.php?threads/fake-gold-sovereign-alert.85348/
This should answer all of your questions about the coin. https://www.coincommunity.com/forum/topic.asp?TOPIC_ID=163125