Found the publication wherein the variety Helvetica is mentioned HERE
They also mention Alp King, Swissmix (heterogeneous mix of something), and Walliser Queen. BTW it's been published in 1999 (field trials started around 1995), is in German language, and the work has been funded/done by the the Eidgenössische Forschungsanstalt für Pflanzenbau now part of Agroscope.
There hasn't been any real Swiss variety since the WWII and except for France, no hemp at all in Europe during the '60 and '70 (according to another, related publication HERE
). Additionally, there's not one Swiss hemp variety found in any seedbank.