Military kanji or numbers?

[Jags1]

Can you anyone translate the numbers, or kanji, on the attached photos? Seems to be a sticker for inventory?
I apologize for the multiple photos as I'm not sure of the proper orientation.
Thanks for the help!

 

[Majestic]

秒時 seconds
四ー五秒 4-5 seconds
延期 extension

 

[joadbres]

Looks like it's the bottom piece of a hand grenade:

 

[joadbres]

Oh, and rather than "extension", a better translation of 延期 would be "delay".

 

[Grandpa Frank]

Even though it looks like the fuse has been removed , the explosive material shown here in the red area also needs to be removed to make it safe.

 

[joadbres]

Even though it looks like the fuse has been removed , the explosive material shown here in the red area also needs to be removed to make it safe.

My picture was just for reference. What the OP has seems to be just the end cap, judging from the posted photos. But it's hard to tell for sure from those photos.

Anyway, better safe than sorry, so your information is helpful.

 

[Jags1]

秒時 seconds
四ー五秒 4-5 seconds
延期 extension

Many thanks for the help!

 

[Jags1]

My picture was just for reference. What the OP has seems to be just the end cap, judging from the posted photos. But it's hard to tell for sure from those photos.

Anyway, better safe than sorry, so your information is helpful.

Many thanks for the info and the concern... it's inert for sure... checked and double-checked.