Very nice, Panzerman! I belatedly took a look at that auction and WOW... what a treasure trove of AV darics!!
There are no known Type I Darics. All shown here are Type III. There is a good piece on the series here https://www.ngccoin.com/news/article/5728/NGC-Ancients-Achaemenid-Daric/ even though I have trouble accepting their 'arrow' subtype as more than a crack that may have been strengthened to prevent splitting. They say it was found to be intentional by microscopic exam so I should not doubt it. I do. It would be interesting to know if anyone has researched the possibility of a die match without the arrow. I have no daric and no Type 1 silver but the coin below is Type II and matches the rare Daric style panzerman mentioned as expensive. I have issues with the extreme variation in 'art' quality of the darics. There is also a hard to understand difference in the reverse complexity of darics that I have not seen in the silver. 1934 WC's coin is an example of both oddities.
I misspoke on this a little. I read this in my histories. I had meant to clarify that these were the first major gold used in major universal transactions. The book explained that the Daric was the first to be used in this manner for commerce or government transactions within Persia and other Cities / States. It was a reflection of power, and transacting wealth to pay taxes, pay for armies, etc. The next major Gold coin was Philip II's Stater, then Alexander III's Stater. Prior to that (Lydia), the coins were used locally.