Hey Cyclesmakaron. I have a few I'm trying to put a date on -
What I think is 1980 or 1981 Aerodynamic - my dad purchased new from the Pedal Shop in St. Petersburg, Florida sometime in the early 80's.
Left side BB shell - B / Right side BB shell E 2290

Next up - what I'm guessing is a Corsa (your thoughts?) that I recently purchased - I think it predates the Strada so perhaps the M on the shell is the employee code?
Left side BB shell - 6 M / Right side BB shell Z 2896

Since I'm a newbie - it won't let me post pics...