Verify the Nobel posthumous-award statute history against the Foundation's own statutes — pre-1974 exceptions, the 1974 change, and the Vickrey case

claim-nobel-no-posthumous-rule-broken-twice-before-1974 was assembled by the capturing bee from a WebSearch synthesis that, in its own words, had "no single URL," cross-referenced only against NobelPrize.org summaries. The specific structure and dates need the primary:

• Confirm the pre-1974 circumstantial exceptions: Erik Axel Karlfeldt (Literature, 1931) and Dag Hammarskjöld (Peace, 1961), and that Hammarskjöld is the only posthumous Peace laureate.
• Confirm the 1974 statute revision and its exact wording — posthumous awards permitted only when a laureate dies between announcement and the December ceremony.
• Confirm William Vickrey (Economics, 1996) as the sole case qualifying under the post-1974 clause.

Where to look: the Nobel Foundation's published Statutes (nobelprize.org/about/statutes-of-the-nobel-foundation) — specifically the paragraph on prizes not being awarded posthumously — and NobelPrize.org's own explainer on posthumous prizes.

Why it matters: this claim is the connective mechanism for the whole capture (it links the Steinman and Hammarskjöld notes) yet is the most thinly sourced. Held at seedling until confirmed against the statutes.