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[OM] Dating a 75/250 Zuiko zoom

Subject: [OM] Dating a 75/250 Zuiko zoom
From: John Hudson <xyyc@xxxxxxxx>
Date: Thu, 01 Feb 2001 21:21:43 -0800
Does anyone know the approximate dates of manufacturer of the following
75/150 f4 Zuiko zooms?

s/n 230*** and s/n 408***

If the dates of manufacture are not known can anyone date either one of
the serial numbers by reference to the purchase date of their own zoom
lens and the proximity of their lens' serial number with either one
shown above.

In addition to the dating of these two serial numbers does anyone know
whether the formulation of the lens design would have changed for the
better or the worse between the two serial numbers or whether the 75/150
was a mass produced lens changing little if any during the course of the
entire production run.

John Hudson

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