Hard to beat a Russian 37mm time fuze but I'll offer this one ~
This kind are more common or were.
Most are badly rusted as they were found in a crate in a river. This one started as an empty body and fuse. The message container and base of the flare container are from one of the river rounds. The sides of the flare container would not come out being rusted in and thin. The wood spacer was also somewhat rotted and charred from heat. So the side of the flare can and wooden spacer are replacements. The original spacer is present. The soft lead storage cap has remains of waxy sealant on it. There was likely a tear off strip on it. These were on issue right up to ww2.
This kind are more common or were.
Most are badly rusted as they were found in a crate in a river. This one started as an empty body and fuse. The message container and base of the flare container are from one of the river rounds. The sides of the flare container would not come out being rusted in and thin. The wood spacer was also somewhat rotted and charred from heat. So the side of the flare can and wooden spacer are replacements. The original spacer is present. The soft lead storage cap has remains of waxy sealant on it. There was likely a tear off strip on it. These were on issue right up to ww2.