OOPS! Sorry, Moose; I saw you posted a photo.net thread, and I falsely assumed
it was the same thread I had been looking at to decode the date portion.
Your link does indeed shed some light on the factory info, although it still
doesn't seem to explain the three-character codes hidden beneath the rubber
focus rings of lenses older than 1980, which would include (I think) all
silver-nosed and single-coated OM lenses.
My 55/1.2 (black nosed, single coated) says "S7Y," which was made in November
of 1977, but where?
Jan
> On 2019-03-07, at 03:16, olympus-request@xxxxxxxxxxxxxxxxx wrote:
>
> From: Jan Steinman <jan@xxxxxxxxxxxxxx>
> To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
> Subject: Re: [OM] OM date codes, factories?
> Message-ID: <CF45202C-503D-4F4B-8C35-2FF9E042BCE8@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset=utf-8
>
>> From: Moose <olymoose@xxxxxxxxx <mailto:olymoose@xxxxxxxxx>>
>>
>> This may help.
>> <https://www.photo.net/discuss/threads/deciphering-the-white-4-letter-code-on-om-equipment.76187/
>>
>> <https://www.photo.net/discuss/threads/deciphering-the-white-4-letter-code-on-om-equipment.76187/>>
>
> Thanks. That?s what I used for figuring out the last two characters, but
> unless I missed something in there, it doesn?t go into the first two
> characters, which are supposed to be factory codes.
>
> Perhaps ALL the camera lenses were made in just one or two factories, and
> they used the same date code system on their microscopes and medical
> equipment, too.
--
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