1965-ish... Rupp Karrier. The ID badge, SK-70... K stands for Karrier and 70 for 7 horse power, i'm not 100% sure about the S but i am guessing that means Standard... or maybe "single"
Check out the drive system!... It's an all in one drive system, rupp referred to it as a "single unit" which might also be what the "S" stands for. It is a very rare duramatic 20A transaxel.