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This was an experimental rocket-propelled explosive device, developed by the British in WWII, for clearing beach obstacles. It was a disastrous failure, and in real life never went into service, but it makes an entertaining wargaming element.
This model is 1:100 scale, for 15mm gaming. Note that there is a small separate cap piece attached to the body by a sprue; this needs to be detached and is used to plug the hole in the central hub.