For grading this coin, I would say somewhere around AU55.
I have always had a little trouble grading the obverse of George V1 coins, despite knowing what a crown sized proof of George V1 looks like because I have a couple of examples. I usually look to the sideburns in front of the ear, and hair definition generally.
The trouble stems from the fact that sometimes these areas are not always sharply defined on the die, although the
RCM usually did better than
The Royal Mint in this regard.
I cannot see any significant hairlines in the fields in the pictures presented, and I really cannot see wear on the high points. Seems to be a slight rim bump above 'R'on the obverse. Can't see any evidence of mint lustre, which prevents me from giving it an 'MS' grade.
The patina that this coin has, isn't a great help for eye appeal, it may have been cleaned a long time ago.