Bruce, this BING grinder is so rare, I have seen only three over many years.
One is mine now, the other is from a collector friend who is a BING collector, the third was sold many years ago in a lot.
The catalog picture of 1912 shows it with height adjustable desk and a rest on the left, but was probably never offered with those features.
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The pendulum is not driven, its just a weight assisted swiveling grinding desk... if you push it, it swings for a while, that's all...!