Four A5 notebooks ordered 1Jan2026 sold and shipped by Amazon JP

I may not like Tomoe River paper personally — whether it was produced by Tomoegawa or Sanzen — but I'm more than curious (and keen to prove) whether it's possible in 2026 to order brand new paper products that contain the 52gsm paper produced on Tomoegawa's machine №7.

So, on 1 January 2026, I ordered these four A5 notebooks together, with the three SakaeTP (paper paper®) to serve as known quantities to compare against the fourth notebook. I also have a few sheets left (from not having sold all that I had, late in 2025) of the machine №7 52gsm paper, that I can use to attempt positive identification.