mintage of just 2 pieces for 1924 half crown George V ?

I looked up the information page on “½ Crown - George V 2nd type” and I saw that for the year 1924 there are 2 entries in the list: the first has a mintage of 2 (!), which is a  frequency of 0.8 %. The one below it has a mintage of 5 866 200 which comes down to a frequency of 14%. For the first, extremely scarce one, no other data is made available, while for the much more common it says “(fr) rainure entre la couronne et le blason”. I would like to know in what respect(s) the two coins differ.

Spinks refer to it in their catalogue (2024) as “specimen finish”… I have not been able to find any other record of them. 

Found one sale of the 1922 and 1924 sets, I believe this is what they are referring to. 

https://coins.ha.com/itm/great-britain/great-britain-george-v-satin-finish-specimen-set-1924-and-1922-not-listed-in-the-spink-guide-but-well-known-these-are/a/340-15206.s

@jbridger311: thank you very much !

No problem, sorry I couldn't find any pictures. I believe if there is any difference in their appearance its due to it being first strike, so they may have kept the tiniest of details or even faults in the die that otherwise were corrected or simply worn/broken away when it came round to circulation strikes.