Hello,
I just checked "Wildwinds" to find more information about your Valens silver siliqua. The mint mark is C dot A signifing that the coin was struck at the Constantinople mint. For the folks who don't collect Roman coins, Valens was co-emperor with his brother Valentinian I from A.D. 364-378. The coin is considered "scarce" with the C dot A mint mark configuration. Valens ruled the Eastern part of the Roman Empire and his brother the Western. They were both born in Pannonia (Austria-Hungary) and probably never actually visited the city of Rome.
Great finds! The other pieces you found with this siliqua are very desirable as well.
Thanks for sharing,
wagbert