So it seems evident that Colonel Bleep premiered sometime in September of 1957 (the 23rd at the latest)...yet there doesn't seem to be anything to show when its series finale aired, just the accepted assumption that it was sometime in 1960 (I'd presume during spring). One thing I've noticed is that of all the episodes found (since 2019), the year of copyright (if any) for them are either 1956 or 1957- nothing of 1958-1960.
I don't know if that means Colonel Bleep ended before 1960. Could it be that the episodes were made in 1956-1957, then aired 1957-1960? I've read about a similar situation happening to the last batch of theatrical shorts with The Three Stooges (i.e. the Joe Besser era). Produced 1956-1957, aired 1957-1959. Although, I don't know what the copyright years are for those, but that may not be relevant. I don't expect there to be all that many similarities.
Another thing: we don't know the original airdates of any episodes (except maybe the first one, as pointed out above). So then there's the question of how its first run was arranged.