In its outer form, this practice A/T mine looks a lot like the German Tellermine35 Üb of WW2.
It differs in the fact that the top can be taken off to insert a practice smoke charge.
These mines were issued 5 in one case, measuring 80x45x43, which weighed some 50kilos.
Diameter : 320mm
Height : 85mm
Weight : 8kilo
Filling : 400gram blackpowder charge.
Photos © M. Jochoms