Japanese 7.7x58mm Arisaka "(○) (○)"

Got this at SLICS because I never saw this headstamp. SLICS is great because you can find treasures in any of the miriads of small boxes and bags. I truly enjoy “digging”, and at SLICS there are many opportunities.


Hello all,
In case anyone is interested, my records say this was loaded by the Tokyo Army Arsenal.

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Do you know its purpose? Elk’s book is very vague about this headstamp. He says it may be experimental.