This bomb was designed to take the place of both of the improvised No. 6 Mk 1 land, and Type 1 No. 6 Mk 1 land bombs.
Bomb, Chemical, Land, Type 1 No. 6 Mk 1
Bomb, Chemical, No. 6 Mk 1
Collaborative Ordnance Data Repository
Old Chemical Weapons Reference Guide (1998)