A quick one, if you please. (I am having an 'old-timer's' moment.) In a 'Ref.' the letters S.C. (before the catalogue number) refer to which catalogue, please? (NOT to be confused with 'Senatus Consulto'.) Specifically 'S.C.979 var.' Thank you.
It's Houghton and Lorber's "Seleucid Coins" : https://www.forumancientcoins.com/numiswiki/view.asp?key=houghton-lorber
@Ryro and @zumbly Oh!! Then I was not having a 'moment'. (One cannot recall what one does not know.) I actually didn't know that. Thank-you.