While doing work on the campus of an elementary school outside of Tokyo, crews performing drilling work started running into the items at a depth of 3-7 feet.
Stuff like this:
Since then, an estimated 1,400 firearms, as well as 1,200 “swords” (actually Type 30 bayonets from the look of things) and a number of grenade projectors, have been cataloged.
Japanese Arisaka Type 99 7.7x58mm bolt action rifle with grenade damage and inscribed presentation plaque captured at Saipan 16 June 1944. The “mum” is present on the receiver, a rarity in an of itself. This rifle recently came up at auction with an estimated price of $1,500.
The right side of the buttstock has a small brass plaque that reads “AT 0440 ON THE MORNING OF 16 JUNE 1944,/AN AMERICAN INFANTRYMAN JUST LANDING/ON THE SHORES OF CHARAN-KANOA BEACH,/SAIPAN, THREW A HAND GRENADE AT A/JAPANESE SNIPER, KILLING HIM INSTANTLY./THE FORWARD STOCK OF THE RIFLE/WAS DAMAGED BY THE EXPLOSION./PRESENTED BY/COMMANDER WALTER BANTAU, USNR”.