Hi David,
Good luck with your last 18 - that list looks very familiar. You may have read various threads here regarding the
Davis "blue C" variation. I'm sorry I missed seeing that image, but those I consider experts deferred on that thread and agreed that it exists. I think the jury was out on "variation" or print freak, but I struck it from my list - as I think most of the new set listings have done.
Best.
--
Mike