Hi Andriulis, The best way to tell the difference is a very slight difference in the pointing of the A in GRA Spink 4021 covers Obv 1 and Obv 2 Spink 4021A is Obv 3 Obv 1: A at a bead Obv 2: A between beads Obv 3: A is just to the right of a bead There's also two reverses for the 1920 halfcrown: Rev A: Raised edge to garter above F, no pocket above C Rev B: Plain edge to garter above F, pocket above C The possible combinations, by Davies number, are: 1+A, D.1672 (commonest) 1+B, D.1673 (scarce) 2+A, D.1674 (scarcest) 3+A, D.1675 (common) 3+B, D.1676 (scarce) In addition, Peter Davies has added a D.1675B, which is a modified Obv 3, characterised by a thicker rim, with tiny beads rather than small teeth. It's probably scarcer than any of the previously documented coins. Sorry it's not photos, but hope that helps Declan : )