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Today a shop from Italy listed a few ZK lenses on eBay:
Zeiss 35mm F2.0 ZK Distagon Lens for PENTAX K Garanzia Fowa | eBay Zeiss 100mm F2,0 ZK Planar Macro Lens for PENTAX K Garanzia Fowa | eBay Zeiss 50mm F2,0 ZK Planar Lens for PENTAX K Garanzia Fowa | eBay Zeiss 85mm F1,4 ZK Planar Lens for PENTAX K Garanzia Fowa | eBay
Sellers has a lot of positive feedback, so seems legit. Might be worth taking a look...
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