The Zenit-B/E spawned the Zenit 12 series (seen earlier) which then spawned the Zenit 122. I do not have my reference material with me at the moment. So I can not give exact dates of production. For sure, they were in production from 1993 to 1997 as I have seen examples made in 1993 and 1997. I would say late 1980s to possibly into the 2000s. It differs from the Zenit 12 series in having a plastic outer body and door. Like the later Zenit 12 series, it used match LEDs for the metering instead of match needle like the Zenit E and early Zenit 12 series. One thing the 12s and the 122s have in common as opposed to the E model is TTL (through the lens metering).
These examples were made in 1993. I have used them as semi disposable cameras for weddings. I would place them about the church so I could grab them and take quick shots without having to worry about loading film into my main camera.