Grading this kind of late little bronzes with such a rough style is in my opinion a non sense, it should be simply described as well centered with incomplete legend on a short flan, with rather well preserved relief and above all very rare. (RIC 427, rarity R4)
However, if I had to grade your pictures...
If authentic (it seems to me, but as you are certainly aware, many forgeries appear on the market for these coins easy to counterfeit) take a look at these 2 coins sold in auction houses
http://www.coinproject.com/coin_detail.php?coin=295567 sold 300 $ (2001)
and this one RIC 425 sold for 460 euros (2018)