So I followed up with the guy selling this patch. Sent him the image posted here by AM. He sent me a scan of a page from a book by a guy named Sutherland which matches the patch he's selling. Image below. AM, do you think the book has it wrong or could the patch have been made in different versions over time?
The seller seems to be a very legit guy -- wrote a book on Marine insignia. Here's his book:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2215890242
and here's the image he sent me: