I got mine in early 2019 secondhand from the polishing god v647c. And he got it from Maxim in 2018 which coincidentally was the time Toyama and Watanabe stopped doing honyakis.I asked Maksim when he might be getting the Toyama Honyaki last year - “don’t know” was the answer.
@lemeneid has at least one - I wonder when he got his
So I guess mine is the very last one?