10 Dollars - Elizabeth II Missionary ship Duff

The Duff sailed from Portsmouth in August 1796 carrying thirty missionaries dispatched by the London Missionary Society — the first organized Protestant missionary voyage to the Pacific. She reached Tahiti in March 1797 after a passage of over seven months, depositing the bulk of her passengers there before continuing to Tonga and the Marquesas. The Society's gamble was largely a disaster in the short term: most missionaries abandoned their posts within years, and the Tongan contingent suffered violent deaths.

The Solomon Islands connection is oblique — the Duff never called there — making this a regional commemorative rather than a locally rooted historical issue.