The amount of work to determine this would be enormous. It’s easy enough to look up, but I doubt anything could ever be pinpointed down to a bad batch from a certain week.I think you might be missing the point. Point is, sometimes if there is more _Known_issues with an iPhone, others want to know which manufacturing week it might be experiencing the Hardware problem.
For example: If a certain batch of iPhones are experiencing ‘Yellow displays’ and it was on week 35, others want to know specifically when their phone was manufactured if their phone might be a factor not during that week number.