I might be getting into the "questioning the "written word" zone...
I've searched all over the interweb, (keywords, word arrangement, syntax, etc.) for attribution, origin, and so on - on anything, from rumor to speculation, to gospel; on the creation of the triangle (or any other stamp for that matter).
Sourcing the correct way to read the triangle arsenal stamp. The PRC's 'Bureau of Firearms Stamps & Proofmarks' resulted in zero hits.
So, if/if it's left to right and inside of the triangle, e.g. /26\, no problemo. BUT, if the stamp uses the outline as the first digit, how should it be read?
For instance, the 256. Could it be 625? Wisdom or flame, I can handle it. image upload