Crossword Genius

Features of coins which make them harder to counterfeit (6)

Ross

I believe the answer is:

ridges

(Other definitions for ridges that I've seen before include "Long, narrow ranges of hilltops" , "Long, narrow ranges of hills" , "Long raised strips" , "Long narrow crests" , "long stretches high up" .)

I've seen this clue in The New York Times.
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