This procedure works for OM 1/2's. Pull off the pressure plate and look at
the date code underneath.
From the FAQ at
http://brashear.phys.appstate.edu/lhawkins/photo/olympus.faq.html
B21) How can I tell when my OM-{1(N), 2(N), 10} was assembled?
The serial number on an Olympus camera does *not* give you a
precise date of manufacture. The only way to tell is to remove
the pressure plate and look for a code either on the back of the
pressure plate or on the back itself behind the pressure plate.
The code consists of 4 characters:
1 Japanese character signifying the assembly plant.
1 number representing the last digit of the year of
assembly (e.g. 7 = 1977, 0 = 1980).
1 number or letter representing the month of assembly,
1-9 for Jan-Sep, X, Y, Z for Oct-Dec.
1 number representing the pressure plate used. Olympus
apparently used pressure plates with slightly
different curvatures to fine-tune focus.
Some examples:
OM-1N - S055 factory "S", 1980, May, plate #5
OM-1 - S766 factory "S", 1977, June, plate #6
OM-1N - S0Y5 factory "S", 1980, November, plate #5
Thanks to John Hermanson <omtech@xxxxxxxxx>
Skip
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***********************************************************
From: "James N. McBride" <jnmcbr@xxxxxxx>
Reply-To: olympus@xxxxxxxxxxxxxxx
To: <olympus@xxxxxxxxxxxxxxx>
Subject: [OM] Camera Production Date
Date: Fri, 24 Aug 2001 12:09:03 -0600
I have a black OM4-T with serial number 11677xx. Can anyone tell me about
when it was made? Thanks. /jnm
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