butterfly
HONOURED MEMBER RIP
This is a mystery that iv had for a while and never seen another prehaps some one might know about it,,,,,,, Dave
Dave, as Jack has already mentioned I think your bomb is a Brand C 50 B
Here are some drawings for you, though credit goes to Jack for identification!!

regards Kev
US subs - very interesting document you posted - I wonder if the photo of the modified bombs relates to the bombs in your document and if so how many were modified??