Ben,
Good information - thanks for the pic. Two comments about my "source" for questions like this:
My "catalogs" are Sweets inserts, which were printed for the construction industry, including architects and designers. As such, they do not include the absolute totality of GE's (or anyone else's) line. So just because a particular model doesn't show up doesn't mean it didn't exist. In GE's case, they usually included a broad-enough range of appliances to offer the contractor a decent selection.
Sweets inserts would have been printed at the outset of the model year (new Sweets usually arrived during the first quarter of the calendar year), so if newer features and/or models were introduced during the year, they wouldn't be included in the catalog. I'm guessing that this would be the case for the Dispensall washers. Between the limited amount of information and the early printing date, my 1973 catalog doesn't include this washer. But, as Ben has shown us, it did exist during the 1973 model year.
lawrence