Engine Order Telegraph discs two (2) ship speed control

2 engine order telegraph discs from a ship, possibly Navy. The black is transparent, light shines thru the words, it's made of bakelite or plastic. The white one is not transparent and is made of aluminum. Each has 3 mounting holes. Both measure 6 1/2" in diameter. Center hole on the black one is 1 1/8", the white one is 1". Both are about 1/16" thick.

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