R.J.,
Sorry to have somehow missed this post earlier. Zeiss brought this Planar out in 1954 as a less expensive alternative to the Biogon. It is a Gauss type lens and much cheaper to manufacture than the Biogon design; the selling price was ~40% less but it never sold well, hence its scarcity. As with most collectibles quality takes a backseat to availability so the prices are high today -- for a lesser quality lens than the Biogon 🙂...so goes the collector market.
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