This is an unusual or experimental tip on a Japanese T-30 bayonet scabbard.

Below, bottom to top are: 

JB101 with ball tip scabbard

JB101 with unusual tip scabbard

 JB102 with the later tubular tipped scabbard

The middle JB101 & the JB102 are in the same series and about 8,000 numbers apart.

Left to Right:  Ball tip, experimental tip, tubular tip