Door in a wall

This old door is set into a very old wall at the north end of Victoria Walk by the Marlowe theatre; it appears to lead to a property known as Beerling Hall. 

According to the Canterbury Historical and Archaeological Society this building was a guest hall for the Dominican 'Blackfriars' monastery; it dates to 1320. It has been used for weaving, as a private house (from 1780), and as a furniture store (from 1905) until it was bought and restored in 1979 by Mr and Mrs Beerling; it is not a community hall. However, as with so much, it now seems to have been acquired by the King's School.

The door is interesting because of the unusual marking on it: