Your Apple ][ production number is low, mine is first half of 1979 production and is A2S1-22365. I have seen A2S1 serials as high as 3765,000515, with a mid (week 20) 1980 production motherboard.
Apple continued to sell the Apple ][ while making the plus, they didn't stop ][ production until early 1981.
Highest A2S2 serial number I've found A2S2-588366, week 5 1983 production (that's after the introduction of the //e in January, 1983), and that doesn't include A2S3 systems (Belll & Howell ][plus).