Another Thing?-A/T Range

Could be a plug representing a base fuze from a Practice squash head shell - 120 mm Tank ammo or for 105 mm as your other photo shows. The threaded hole in the base was most likely for a tracer unit. Operational fuzes for 120 mm squash head (please don't quote me on this) were I think L56, L58 and L71 - there may be others.

Thanks AMMOTECHXT