Featured in the recent expanded & revised edition of Rene Rondeau's essential Hamilton Electric book, "The Watch of the Future", are these very rare prototype mahogany and mother-of-pearl dial Hamilton Electrics. Although shown here in the Pacer and Flight cases, they were part of an experiment in the Sherwood wood-dialed series (shown on bottom).
1961 Sherwood Automatic (auction link)
You can order the 4th edition - "The Watch of the Future" here -> Link
My other Hamilton posts;
2001 Space Odyssey Flight II Prototype
Richard Arbib & The Hamilton Electric
Hamilton Odyssey X-01 Reissue