This lens (or my copy) can't be described as Olympus' greatest achievement. I think this was the kit lens with one of the earliest EM models. Forgot which but it doesn't really matter.
Olympus 12-50 f3.5 - 6.3 EZ (24-100 35mm equivalent)
Size: 83mm x 57mm
Aperture: f3.5 - f22
I like the range 24mm - 100mm in FF ...