Any ideas of this zinc coated steel tray, dimensions 95x222x35(h)mm? It is Russian, ordnance related and made before 1940. It nicely accomodates 20 pcs Koveshnikov fuzes, BUT both spoons and exploder tubes go near 20mm deeper than the height would carry. Further at one end on one side is a 60mm long and 4mm wide cut for something.