A.S. Type Bombs in RAF/Commonwealth indicates Anti-Submarine Bombs
http://ww2data.blogspot.com/p/british-ammunition-explosives-and.htmlKopfdorfer gave detailed Info about the content of the Cluster, which indeed matches 1 of 3
similar looking assemblies.
Cluster Projectile 500lb No.7 Mk I (Service) 56x8lbCluster Projectile 500lb No.17 Mk II (Service) 26x20lbCluster Projectile 500lb No.24 Mk I (Service) 20x20lb (US Type)Cluster Projectile 500lb No.17 Mk II (Service)
Contents: Twenty six 20lb fragmentation bombs, specially designed for use in this cluster
Overall length: 63 inches (with blunt nose)
Width across flats: 15 inches (octagonal in shape)
Tail length: 27 inches
Total diameter: 17.5 inches
Total weight: 582 pounds
Fuzing: Tail Fuze No.885 Mk I
Tail No.: No.63 Mks I and II
Color and markings: Dark green overall