Hi all. In another thread I asked a question relating to my Olympus 50mm 1.8.  Since then I've been looking into the Olympus lens history and quite fascinating it is too.  Now; I maybe wrong but there appears to be a 'Hierarchy' amongst the 1.8's

There seems to be much controversy over which lenses are better. Newer lenses? Older lenses with the so called silver nose?  I have two 1.8s. One is marked Japan and MC so it is definitely multi-coated. The other is marked, Made in Japan but the glass r

Could be some useful info here,...http://f.webring.com/hub?ring=olympusom
 
It does mention that there were no less than 5 different versions of the F1.8.

Olympus began multicoating OM lenses early on, so it is somewhat rare to run across a single coated lens.  I have over a dozen OM Zuikos and they are all multicoated.  Some are labled as such, some are not.
 
There is a common wisdom that the Jap