Many years ago someone maintained a site with a list of F3 serial numbers and asked for dates of purchase. I had entered mine in with the purchase date. I cannot find this list on the Web as of today, I suspect it is defunct. Too bad, it had a lot of F3 SN's on it.
Yes, I know of the site to which you're referring.
Unfortunately that list is useless as it only shows purchase dates, not production dates.
Some of the dates associated with the serial numbers were shown as being years apart.
In fact; that useless list was the one that inspired me to do something better and more accurate