The history table I have of production timelines shows the CE-1 as in production until late 1984. I don't remember precisely where I got the table, but I believe it was from here: Amazon.com: Boss Book: The Ultimate Guide to the World's Most Popular Compact Effects for Guitar (9780634044809): Hal Leonard Corp.: BooksSept. 1988
Boss Pedal Serial Decoder
I'm not disputing what the serial decoder has indicated. Just noting that the two sources differ. 1988 seems kinda late to me. The same chart indicates that the CE-2 stopped production at the end of 1982, and the CE-3 started production in late 1982. So, the idea that the CE-1 would have been produced at the same time as the DC-2 was in full swing, the CE-3 was starting to wind down, and the DM-3 had stopped production, seems kind of odd. Particularly, since the MN3002 that the CE-1 depended on was out of production at that point, and eclipsed by other chips, like the MN3004 and 3204.