This specific series is a signature release for professional player Silva Saarinen.
There are frequent "new series" of high-quality proxy cards for games like Magic: The Gathering, such as those from Proxy King or PrintingProxies.com . SERIES PROXIES (NEW)
This phrasing likely refers to one of two recent and distinct "Proxy" releases or technical topics: 1. Disc Golf: Silva Saarinen Series Proxies This specific series is a signature release for