I only have Steve Frey's 1971 3L serial # (3V5956). Don't have numbers for his 1968 1600 or his 1800.
David Rattee has gone thru my list and we found one that was in Florida that I had the wrong info on. Other than that, I don't have any more info regarding 1800s'. David is the most reliable source of info. Sorry I can't be of more help.
Take care.
"Don" (Moderator}