Notes on verification

Multiple independent institutional sources (university museum, national research institute, library catalog, encyclopedia) converge on October Meiji 22 (1889) as the founding date, though all likely trace back to the magazine's own publication records. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.833 clusters=3 claim_tier=everyday | framework convergence=partial on Original publication records/colophon of Kokka magazine issue no. 1, as preserved in library catalogs and institutional archives (upstreams: Kokkasha (publisher) issue records, CiNii/NDL library catalog data, University of Tokyo museum archives) — publishers independent, evidence may not be | kind=empirical eligibility=high]