Um... 

Praktica FX2. 29,000 produced.

Exakta RTL1000 86,000 produced

Canon AV-1 50,000 on first production run

Praktica BC1 91,000 produced

Praktica B200S 80 first run, 100,000 second run.

Technically the FX2 is the rarest.

If you do indeed have a first run B200S, you have a nice collectors piece. The serial number will show if it is indeed from the first run.

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