I have a used Shinko 705 rear tire.
Tread depth is currently 5 mm down the very center of the tire. The tread depth on the very outside edge of the tread is 8mm. ( I believe this is the depth when new)
I got 12,000 miles from my last 705 rear tire.
No damage or issues.
The manufacture date of the tire is the tenth week of 2023.
These are currently selling on line for $125 - $133