I have been fully entrenched in trying to grasp some information regarding Hagi lately. Since it is hard to come by, I will endeavor to share with you as I get it from Japan.
I recently noticed several teabowls floating around out there called "Ippuku-wan" produced by Seigan in various glazes at what seems to be a pretty affordable price of 34-45 USD. Since I have been working on some TCer Hagi Special Offers that were similar shapes, but not called Ippuku-wan and were generally about the same price despite the Special Offer pricing, I had to find out more ... and then even moar.

I noticed the Ippuku-wan sets did not include a wood box, but did include a Chataku and were offered as such by several vendors. What I did find out is that they are mass produced units, usually produced in quantities over 1000 at a time (1,300 was quoted by Seigan).
This is compared to runs of 1-50ish of the more "exclusive" pieces such as ones I have been working on for Special Offers. Of the 1-50 pieces started by Seigan, as few as 10% to as many as 50% will receive the ultimate seal of approval of Seigan and then the more exclusive sellers of Hagi who also reject pieces commonly and return them to the Kiln. I found this pretty interesting.
One item that I have been working on for the SO's has had 0% meeting Seigan's standard for such an item in 2 consecutive runs, thus the SO has had to wait for 3 months so far, this will be a very special offering, indeed!!! BUT it will be worth the wait.