Topcon R III
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Topcon R III image by René Lamothe (Image rights) |
A small revision to the Topcon RII, here Tōkyō Kōgaku has combined all shutter speeds onto a single dial with even spacing; and a clip in front of this permits adding a selenium meter coupled to this dial.
Sources (including the manufacturer's own advertising) may refer to this as the Topcon R3 automatic.