Nice score! Looking forward to seeing it cleaned up, always fascinated by Continental touring bikes. The shifters might not be original spec but they are period correct (i believe...) so the OP may have specc'ed those when purchasing the frame. Those stem shifters shift great and wouldn't be out of place. You could go with bar-ends as well.
I can't help you regarding the year of mfg.
Good luck with your bike. BTW are in the Western or Eastern hemisphere? Asking because I haven't seen too many bikes likes this on this side of the pond.