do you have valid proofs that yakuza was active in the early 1800s? i've never found it, post the sources if you have
the origins of the yakuza are uncertain it is not clear if the precursors are the bakuto,the tekiya, the kobuki mono or the machi yakko, there is not any written document that proof yakuza was active in the early and middle 1800, it emerged at the ending of 1800 and yamaguchi-gumi was founded in 1913; so italian mafia (at least camorra/sicialin mafia) and some triads seems to be older being active since early 1800s