Lawrence -
The dryer in this picture is actually a 1970 or 1971 model. Within the last year I acquired this same model from Martin/Yogi. Mine is a 1971 model built in late 1971. It's a low-end 200 series dryer, but it still has Normal, Perm, and air cycles. The wattage on the heater is 4400 watts instead of the more typical 5200 or 5600, so it might be a little slower. The reverse side of that is it might be tad more gentle, that is if 5200/5600 watts is ever too warm.
For reasons which elude me and have always made me very curious, Sears reprised a number of console and knob configurations in the early 1970s on some model dryers. The console on this model is nearly identical to that used in many 1962/1963 models, except the trim colors were changed. This was done also with some same era 24-inch washers, but it was not done with their 29-inch washer counterparts, OR in perfectly matching pairs. I have no idea what marketing was thinking, but these models often fool people into thinking the machine is much older than it is, especially to those of us who know more than the average consumer about what models looked like in the early 60s. The 1972 built dryers are a little bit more obvious because they have the '72 debut of the plastic door handles, which stand out as "not so old" much more readily than this model with the heavy chromed handle.
Tom refers to some of the earlier dryers which did indeed have an externally mounted lint filter. These were made on dryer models that had the belt-drive blowers, which ended by 1966. I was unaware that users had to choose between having the machine vented or having a lint filter. The catalogs always describe these machines as having a "rear mounted" lint screen. The user was expected to reach behind the dryer, on the right top behind the timer, to remove the filter. My assumption has been that the heavy felt trim around the screen would seal the airflow just as it does when in the other location, perhaps not? I have looked at these from a lack of convenience perspective only vs. having compromised venting or filtration. These models were limited to the single cycle 400 series, and the two or three cycle 500 series models. Once moving into the 60/600 series, the filters were always top mounted. The rear screens required less (or no) internal ducting inside the dryer's cabinet, but I always assumed that venting was done from beyond the "lint box" on dryers so equipped. I am sure that eventually one will show up here that we can explore.
Gordon