There is a new “oldest Apple ][+ I have ever seen” (or at least, seen a label for). Prior to this, it was A2S2-11547. The new smallest serial number (on an Apple ][+, A2S2-) that I’ve seen is A2S2-10087:

A2s2 10087

Board date: second week of October 1979.

A2s2 7941

And: It’s in my office.

A2s2 7941 in office

A2s2 7941 in office top