that's the one someone mentioned locktiting in place earlier, correct?
hint, hint.

and it seems the miche BBs have a problem beyond that... the cup threads fail.

conclusion: bottom brackets without lock rings and shoulders are bad ideas... and avoid miche when choosing a new one.

interesting that the box doesn't match the BB that rusty bought... maybe someone else thought a BB with no shoulder or lockring was a bad idea, and swapped in the earlier, discontinued parts....

the shoulder and lock ring help reduce thread loading and wear.
and i'd still like to know what anti-seize or grease was placed on the BB threads before installation.... whatever it was not only prevented seizing, it allowed the cups to continue to move during riding.