Between 1885 and 1908 it was believed that the signal had been sent using the 1799 code book, as in 1885 it was pointed out that this had not been replaced until 1808.
Antara tahun 1885 dan 1908, diyakini bahwa sinyal tersebut dikirim dengan berpedoman pada buku kode 1799, karena buku kode tersebut tidak diganti sampai tahun 1808.