Brian,
I have 3 types (there could be more) of 50mm f1.8 with front rings as follows:
1. 50mm f1.8 F.Zuiko Auto-S OM system Olympus 1545571
2. 50mm f1.8 Zuiko Auto-S Olympus OM System Made in Japan
3. 50mm f1.8 Zuiko MC Olympus OM System Auto-S Japan
Only the first type have the serial number on the front ring
the other two the number is on the chrome ring as describe.
If I am not mistaken the first type F.Zuiko is the earliest.
Hope this helps.
Regards
Eddie
>I asked the vendor of 'Bay auction 1334872142 if the lens had "Made in
Japan" on the front ring, and a serial number on the chrome ring next to the
bayonet fitting, and here's his reply.
>
>> Yes - Lens Made in Japan in on the first ring. I can't see a serial number
>> on the chrome ring, but on the front of the lens the number 225198 looks
>> like it could be a model or serial number.
>
> Did some very early 50mm 1.8's have MIJ on the front ring?
>
>Brian
>
>
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