A Mystery Hammond Chord Organ

The instrument pictured above is a Hammond model 2022, according to a correspondent.

It appears to be one of Hammond's later efforts, but is still tube-based, not solid-state.

It has only four chords per key -- major, minor, seventh, diminished. The chord buttons are larger than the ones on the S Series chord organs.

The tone tablets are rearranged, and there are fewer of them. Some of the tablets have standard "organ" names like Flute 16'.

No ideas when this one was produced, but I expect it was the early 1970's. Perhaps it's an example of a Hammond "Sounder".

Update! After a little digging around in the archives of the Hamtech mailing list and a Google Discussion Groups Search, I found a few tidbits of information:

One correspondent mentions that in addition to the S series Chord Organ, Hammond also had the "2000 series", introduced in 1964 and which originally bore the name EVERETT. The Hammond name was substituted later.
A two-page Hammond ad in the August 27, 1965 issue of Life magazine featured color photos and prices for several Hammonds, including an M-2022 "Chord Organ", priced at $585 (walnut) or $620 (cherry).
[Everett had two models -- ] a 2000 and a 3000. one was a chord organ the other a spinet. Hammond bought Everett in the 60's and marketed the Everett organ and Everett marketed 2 or 3 Hammond pianos.

Any more clues? Drop a note to the author: CLONK