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Turns out it was teak wood.
Teak was the preferred would and the red brown color wouldn't be a mahogony stain, but the natural color. As teak is sourced from the Thai/Burma area, Dec. 7th ended the supply chain. Douglas-Fir was substituted on the newer carriers in WWII, and that would have to have been stained and subsequently painted. finescale.com
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Douglas fir with Oregon pine borders. Teak was only used on battleships and cruisers As even with the supply chain active there wasn't enough Teak.