I have also have one and gave it to my son who wanted it. It has the old connector. Found out after giving it to him they are valuable.
But NOT older than me. I am old.
But NOT older than me. I am old.
I'm typing this on a Model M I picked up from my keyboard corner just now. As I recall, this one doesn't work well; pretty soon, it will stop registering some keypresses. Never have been able to work out why :/