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First widely-available SLR with instant-return mirror $99.50 with f3.5 lens in 1957 ($759 in 2009 dollars)
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Here's the Tower 23 in a 1956 Sears Canera Catalog:

Here's an ad from the April 1957 issue of Modern Photography,
which I believe to be the IIb's first:
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This ad is from the May 1957 issue of Modern Photography:

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