From Badges and Insignia of the British Armed Forces.
"In 1923 the RNVR acquired one non-substantive badge of its own - a two-bladed propeller, with a crown and star above and a star below, worn by chief motor mechanics, and with the stars but without the crown by motor mechanics. This two-bladed propeller must not be confused with the longer two-bladed airscrew worn by some ratings of the Fleet Air Arm. This RNVR badge died out during the Second World War."
The RNVR cuff letters listed in your AFO 654 were introduced in 1924.
David.
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