hi littlehand .
That is when the engraving ( for want of a better word) has been erased from the rim. I think that
is what EOA means , as for finding one with 1877-78-79 bar , Good Luck :) . They are scarce as it is.
And they are worth more on the market. I just had a quick look in my book , and last time I checked there
were 8 for sale , The least expensive was 620 quid , 6 others between 1000 - 2000 , the last an Isandlwana
recipient just on 7000 quid.