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JOURNAL

The Zuffenhausen Keys Journal

Porsche expertise, market intelligence, and thoughtful guidance for collectors, buyers, and sellers.

A considered perspective on the cars, specifications, auction results, and market forces that matter.

MARKET INTELLIGENCE · JULY 2026

Why Buyer Confidence Changes Porsche Auction Results

Two comparable Porsches can reach very different outcomes at auction. The difference is often not mileage, color, or options alone—it is how effectively the seller removes uncertainty before bidding begins.

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MARKET INTELLIGENCE · AUGUST 2026

The Documentation Serious Porsche Buyers Expect

“Full service history” is one of the most frequently used phrases in Porsche listings and one of the least precise. Sometimes it means every invoice is present from the first service forward. Sometimes it means a stamped maintenance booklet and a handful of recent receipts.

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COMPLIMENTARY RESOURCE

The Porsche Seller's Playbook

A practical framework for preparing, presenting, and positioning a Porsche for sale—with guidance on documentation, photography, pricing, provenance, and buyer confidence.

A more considered view of the Porsche market.

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THE COLLECTOR'S BRIEF

Latest from the Journal

Analysis and practical guidance for making more informed collector-car decisions.

Considering a significant Porsche decision?

Zuffenhausen Keys provides private guidance for collectors buying, selling, or evaluating exceptional automobiles.

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