Bruce,
The Sword you had shown came from a post at the WAF, here's the other pics that came with it.
Again you can see the tsuba with the extra Side-Lock slot provided.
It is only these type of tsuba that are found on swords which have the extra 4th fuchi stamp, that of 仁 , the Jinsen Army Arsenal acceptance stamp.
We know that the Tokyo arsenal had been trying to unify the specs, and make parts between arsenals interchangable, so what is your reasoning behind this, and why is the possibility of -these swords initially being 'production samples' accepted, checked, investigated by, or approved by Jinsen, considered to be 'Wild Speculation' ?
These swords appear at the 28k, 70k, 80k, 120k and 139k Serial ranges, and only in small batches.
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