This article is from the Yashica SLR FAQ, by cg@evrl.xs4all.nl (Cees de Groot) with numerous contributions by others.
The FR is basically the same box, but without the automatic (aperture
priority mode). It was introduced around '76 as the first of the FR
series and, apart from the fully manual operation it mainly differed
by the fact that it had a CdS-based metering system with LED
indicators.
 
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