It's a "N" model from 1968-70.
It's a WCDAN, the basic two speed "Custom Deluxe" model with black knobs and no "Rapidry 1000" spin. (the spin speed was 630 RPM, a bit lower than on the previous "L" models.)
The other "N" line Custom Deluxe model included the Rapidry 1000 model (that was the "WCDATN"), the "fabrics selector" model (WCDAFN), the model with the suds return option (WCDARN) and the models with the infinite water level and "Lint Away" light (WCDN and the WCDXN), the WCDXN added the problematic infinite speed control.
There were also a few "Gold Crown" models with similar features as the various Custom Deluxe models but with white/metallic gray control panels instead of the black and silver panels.