According to user CTCaer on GBATemp, a Nintendo Switch serial is composed of 5 digits/letters that indicate manufacturing information that’s irrelevant to the date it was manufactured (see below), followed by actual information on the batch.
https://gbatemp.net/threads/switch-f...2#post-7524125
http://wololo.net/2017/09/05/knowing...tch-will-come/
https://gbatemp.net/threads/switch-f...2#post-7524125
http://wololo.net/2017/09/05/knowing...tch-will-come/