Cold Steel knives that were made in Japan used VG1 not VG10.
Aus8 and Aus8 are Japanese steels made by Aichi Steel. VG1 and VG10 are also Japanese steels made by Takefu Specialty Steels.
3V is an American steel. You can't established COO by steel type alone. Taiwan, while a big steel manufacturing country, does not produce a cutlery grade steel.
Therefore, knives made in Taiwan are generally imported from either Japan, US or Germany.
I can't tell you much about the Taiwan or Italian manufacturers. And I would think as they are current, they might be considered proprietary information.
But Cold Steel's US and Japan production is now pretty much all history.
Cold Steel started with the carbon steel knives marked "Carbon V" manufactured by Camillus. That ended in 2006 when Camillis went bankrupt.
Concurrently with that production though, they had knives made in Seki Japan in Aus6 and Aus8 stainless. The majority of these were made by G.Sakai, Hattori and Kinryu.
A couple of small contracts went to minor factories like Ido Cutlery in Mino City, just north of Seki.
G.Sakai last made all of Cold Steel's folders, as well as SOG's. Today they continue to make Spyderco's Seki knives.
Hattori still makes the San Mai III Trail Master and San Mai III Master Hunter. They used to make almost all of the VG-1 core San Mai III knives from 2007-2015.
A couple modes were made by others, such as the San Mai III Laredo and Natchez by Kinryu, and the SMIII Ghurka Khukri by Tak Fukuta.
The Seki makers, while competitors are also members of the Seki Knifemakers Guild and in cases where OEM orders exceeded production capability they sometimes
subcontracted out among themselves.
G.Sakai and Hattori (who makes Fallkniven knives) are stll in business, but Kinryu, who made the Aus8 and VG1 SRKs and Recon Tantos closed their factory in 2017 due to the owner having health issues.
After 2015 due to the strengthening of the Japanese Yen, Cold Steel turned to Taiwan production. Cold Steel always had a few Taiwan made models going back to the 80s but they were limited. They also at one point produced the Trail Master in China but that ended fairly quickly with Cold Steel citing "quality concerns" as a reason, and they switched to Taiwan manufacture.
The current Cold Steel "San Mai" series manufactured in Taiwan use a VG10 core steel imported from Japan.
The overal quality and reputation of Taiwan manufactured knives has grown immensely over the last two decades.
You can get some more detailed info from my website: