Someone on a German forum who has both claims the head is identical to the Parker 99RCould be a Parker.
EDIT: After seeing the photos in the link below, I think it could be a Chinese made one.
https://forum-der-rasur.de/forum/threads/wilkinson-sword-classic-de-tto.1069/
It was the shape of the head in the picture on the box that made me think Parker. I have a Parker TTO that came with a Penhaligons travel set.Someone on a German forum who has both claims the head is identical to the Parker 99R