I have come across two cards, both British printed issues of Lyndhurst subjects, both mis-numbered 868 on the rear. I can only assume that these were from the same batch and the printer printed the wrong number on several different cards. I wonder if there are any more out there.

Thanks to the kindness of a site visitor, I have been able to fill in a gap in the checklist. See card 1782 - East Southsea Beach