Thanks for finding that.
So OL1 is 1st week of November 2000.
The funny thing is I have a lot of chips (bought from US used stock dealers about 15 years ago) which are OL1 and OM1 so they are all very close to each other.
These are all good stock, After that, I started getting counterfeits as the chinese discovered "movement" on this P/N. Fortunately they were dumb enough to mark it with a nonexistent P/N
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
![](https://peter-ftp.co.uk/screenshots/202408134219385807.jpg)
The seller was very upset and insisted on payment but luckily we had an account so sent them back, and I never bought any more other than new stock from Hitachi distis. The LTB was about 10 years ago and that product is still selling but I have tons of CPU stock.