Single Status Update
The information in the CHUO EXPRESS Excavation page was about Jomon Period items.
I was hoping I could find more information/websites about any newer excavations that might be the bowls the seller has.
I don't have enough/any Japanese knowledge on key words or phrases to use for the internet searches for newer Mino Bowl excavations.
The ending part of the seller's bowl descriptions had this :
" All four pieces I had TL-tested (Cost about $ 400 per piece) have confirmed an age about 400 yrs =/- 20%. "
I think he explained they were random from the batch of bowls he had..
This is from one of many TL Testing websites on the internet:
Accuracy of TL testing / dating
Generally speaking, when a sample is drilled and there is no information available about the burial environment, one may expect +/- 25% uncertainty, and this is more than adequate for authentication where the question is whether the piece was fired in antiquity or recently. The latest computer technology supports and completes analysis.