Oldest Mcintosh Pre with remote

I've been looking at used McIntosh amps lately and wonder what's the oldest models(s) to have a remote for volume?
C31V maybe?
My earliest was the C712. I don't think t was the first though. Take a look at these two links and you may find the answer.
The 1991 c37 is vintage, maybe not the oldest, and is a step up in sound from their earlier models. I love mine, but I'm missing the HR37 remote, and they are hard to find, so if you buy a vintage Mac make sure it includes the remote.