That is the arsenal mark.

by Hoot @, Diversityville, Liberal-sota, Friday, January 30, 2015, 10:05 (3590 days ago) @ Catoosa
edited by Hoot, Monday, February 02, 2015, 16:00

The Koishikawa Arsenal in Japan made both the Arisaka's and Siamese Mausers. It is referred to as 'stacked cannonballs'.

Edited to correct the arsenal name.


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