Who knows what this is?

[gerbenvh]

i recently got this projectile offered to me by a friend, but i can't seem to figure out what exactly this is. unfortunatly i don't have any better pics than these.
does somebody know what it is?

 

[2pounder]

from the stamping on the side it looks to be a 105mm tank base eject smoke shell. missing a driving band and should be able to see up inside from the bottom.

 

[AE501]

It is a Shell 105mm Tank Base Ejection Screening Smoke for the 105mm L7 tank gun. There were two variations within the only mark, and Empty Design Dwg. SX958 is the later one.

 

[Ryan Andrew]

105mm tank, smoke shell. Made by Royal Laboratory, as part of lot number 63, in March 1970.