In 1997 our honeymoon was a 61 day RTW trip primarily on SQ in First. On the first leg we told the FA that this was our honeymoon.
On each subsequent leg the FA's would come over and congratulate us on our wedding. While waiting for our flight in the lounge at Singapore we were approached by a SQ staff person who gave us a voucher for $250 for tax free merchandise as a wedding present!