The link you posted is incomplete and goes nowhere - this is where I had to go, via Google : http://www.michael-coins.co.uk/hc1920%20rev%20A+B.htm Yes, I would say your halfcrown is definitely Rev B - it's too high a grade for it to be a Rev A "with the garter ridge worn down". Also the gap between C and the garter, and the 'flat' 9. However, according to Davies' classification, reverse B occurs with both obverses (Michael is mistaken about this) : 1+A (deep portrait) common 1+B (scarce or rare reverse) 2+A (rare obverse) 3+A (shallow portrait) common 3+B (scarce or rare reverse)