is this a japanese paratrooper bayonet?

[Flying10uk]

but I felt the fool!

You're not a fool but it's best to do your homework or get advice first if the item is expensive and you're not sure, before parting with your cash.

Anything for sale that that has an "elite force" prefix in the description such as Airborne, Paratrooper, SAS, Marines, or any other elite force is likely have a significant premium on the price sometimes because the seller has tried to connect the item for sale to an elite force.