I haven’t had a Reuben in years either, because none can compare to the One True Reuben I used to get at a place in the Midtown area of Detroit called the Schnelli Deli. Alas, long gone now. Part of what made it so good was the sauce or dressing used. Most places use Thousand Island dressing on their Reubens. The Schnelli used a dressing that was a much darker reddish-orange color (like the color of some types of Russian dressing, but I don’t know if it was Russian dressing). I asked the owner about it once and he would only say he imported the dressing from New York. So I had assumed that it was an authentic New York dressing used on proper Reubens, but I looked up a picture of a Carnegie Deli Reuben and it had the pale orange Thousand Island dressing on it.
I actually made a post on my Reuben experience over 10 years ago: