Ulrich Kaltenborn

Specialist playing-card collector, online handle "trzes," who has built his own physical reconstruction of the 15th-century Topkapi Mamluk deck and documents the project at spiorad.net, engaging directly with L.A. Mayer's and Michael Dummett & Kamal Abu-Deeb's academic texts on the deck's structure. Matters to this vault as a Tier 2 specialist source for the Mamluk deck's suit structure, independent of Simon Wintle's corroboration (entity-simon-wintle) — though his account of why the coin suit was reinterpreted as a polo-stick suit turns out to be his own hedged inference, not a citation to Mayer or Dummett.

References

• claim-spiorad-net-mamluk-suit-resemblance-is-uncited-inference
• Captures: 10-inbox/raw/2026-08-18-does-a-primary-source-confirm-the-two-hop.md