Scott, interesting question. I'm not knowing the details regarding changes in drum baffles. My note on John's dryer says it's a 1970 model, as compared to Kevin's being 1968 ... but I don't know for sure as I don't have a pic of the model tag, and for some idiot reason I also didn't get a shot of the control panel.
On a quick look at the four Whirly dryers in my garage, RJ's 1985 standard-capacity has two small integral baffles and one larger plastic attached. The other three are super-capacity (198x Kenmore, 1992 KA, and 2003? Calypso-match) and have three plastic baffles, 2 large and 1 small IIRC.