Achaemenid Siglos Countermark?

Nearest counter mark match appears to be No.29

@echizento thanks! for a type 3 it's a very bold strike and has nice patina... coinage history at its finest, I've just been curious about the countermark

@sel_69l I added another clearer photo... I don't think if it's 29, a part of the countermark might be also missing because it's right on the edge of incuse mark

Hi! I believe this question was left unanswered.
I can quote an article by Doug Smith called "Countermarked Coins" posted on his ancient coin's website:




And this may not have been implicitly asked in your question, but just to be sure I'll mention anyway that the Persians were not the only people in antiquity who counter-marked their coinage. And there has been also a wide variety of reasons to do so.

Back to your coin, I looked at hundreds of samples on the web and couldn´t find any identical countermark. But... if this banker/authority used to punch the coins right on their edges... how many coins may have this mark without them being clearly shown on the typical internet picture?

Anyway... absolutely beautiful coin, congratulations

I don't know about the countermark but cool Siglos, the kneeling Darius (if thats who it is) is looking much sharper than my example.