Model 30 bayonet

Hi Guys,

I saw a type 30 bayonet with a straight guard on it, a plain blade without a fuller and wood grips.
When did those come into use?

Thanks

As the war progressed, the bayonets got simpler. The more simple it is, the layer in the war it was produced.

As mentioned basically late WWII. It was the last manufactured iteration of these bayonets as soon afterwards Japan surrendered.

Thanks Guys