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Listed at $500 plus actual shipping but the seller said the
Make Offer option is set to auto-accept at $475.
Seems to be in excellent condition with original case, hood and front cap. Rear cap appears to be Pentax (which is better IMO).
Sigma Art 35mm f/1.4 HSM DG Lens For For PENTAX/RICOH
This is one of the sharpest and fastest 35mm AF lens available for Pentax at the moment. I absolutely love mine.