Single-sided seal. The bishop is depicted according to Stevenson and Wood ‘in usual attitude and vesture’, i.e. front face with his right hand raised in benediction and his left holding a crozier, and within a Gothic niche.
Image description (reverse)
Legend (obverse)
S’ MARCI DEI GRACIA SODOREM EPISCOPI (“Seal of Mark, by the grace of God, bishop of Sodor”)