Markings would be in red or orange ink, stamped with a pad, if on the back
of the pressure plate. Factory code in those days would be with a one
letter like E, H, P etc. This info wipes off very easily though traces can
often be seen in the metal. My list shows codes for up to 26 different
Olympus assembly plants. Your "red herring" numbers were written by someone
else, and probably have nothing to do with Olympus production. The fact they
are in pencil is one tip off. KGB is not an assembly plant. Perhaps they
are the initials of a previous owner, numbers
could be his birthdate.
So on the pressure plate E 7 Y (stamped in line) would mean Tatsuno (?)
plant, November of 1977. K 6 Z would be December of 1976. Another number
stamped out of line with the first 3 symbols would be the pressure plate
number.
When production info was on the pressure plate, Olympus would use X - Y - Z
to represent Month 10, 11, and 12 of production. Your E 1 1 numbers could
mean
January of 1981. Possibly meaning that your 2N was assembled before new
codes were used (which I think started in 4/81)
In the early 80's Olympus changed over to a 2 letter code to represent the
factory the item was made at. TN, HJ, FA, etc. When they switched to the 2
letter code, info was no longer put on pressure plate. Years were
represented with letters (81 =A, 82 = B, 83 = C, 84 = D, 85 = E, 86 = F, 87
= G etc.) Months represented by numbers (January thru September = 1 thru 9,
Oct. thru December = A, B, C) So HW C 8 is HW factory (?) August of 1983.
In OM bodies, it was stamped in small white letters in the film chamber.
This info can be wiped
out during a cleaning, unfortunately.
----------------------------------------------------
John Hermanson www.zuiko.com
mail: omtech@xxxxxxxxx
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 Turnaround 4-5 weeks
----------------------------------------------------
----- Original Message -----
From: "Roger D. Key" <rdk@xxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Sunday, December 28, 2003 8:43 AM
Subject: Re: [OM] production info on OM2n?
>
> I have to admit that I have not seen the KGB bit before.
>
> Other than that, the large red number 4 means pressure plate curvature 4
> (the normal).
>
> The E is actually a japanese character giving the manufacturing factory,
> and the 11 means 1981, January.
>
> Roger Key
>
>
>
> Alan Wayman wrote:
>
> Hi,
> just took the pressure plate off my newly aquired OM2n to discover the
> following -
> written in pencil behind the plate KGB 61.2.8 and a large number 4 stamped
> in red
> stamped in red on reverse of pressure plate itself - E 11
>
> does this info shed any light on date and place of production like the
info
> behind the pressure plate of OM1?
>
> can anyone help out?
> Thanks,
> Alan
>
>
>
>
>
>
>
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