I held out for some time for the addition of a footstone at least.
"Wessex Tales" by Thomas Hardy
Wooden headstone painted white and small footstone.
"The White Christmas and other Merry Christmas Plays" by Walter Ben Hare
This same cipher is repeated on the footstone, and is evidently intentional.
"Blackwood's Edinburgh Magazine, Volume 61, No. 377, March 1847" by Various