What does the word "currency" mean? I mean, I know what it means, but in thinking about this, to me it has always meant paper money, as opposed to what is called "coinage," or "coin." Also, it means money as minted by a government, as opposed to a coupon.
If this had been a coupon, I think he would have written "coupon." My opinion.
The word "item" is not normally used to describe a group of similar things, but maybe if it were being used as "item of evidence," it could be....such and such item of evidence consists of this group of coins. Because they would not list every one separately.
But if we look at "item" as a single object, it therefore has to be one silver object having a value of 10 or .10. A dime or a $10 silver piece.
If we look at "currency" as being money, then we can't have it be a coupon equalling 10 or .10, but if we look at "currency" as also including something redeemable for cash, then we could have it be a coupon. Or a token having a value of .10 or 10.
Are we any closer? Probably not.