Phil, you are right; it was the model line starting in 1965 that had the two levels of dryer performance. I remembered reading it in the spec sheets, but did not remember when they started making the differently performing dryers and I was only looking at US models. It was a crumby thing to do, like their cheapest washarm dishwashers not having a detergent dispenser so only one wash and no pre-rinse and that in the mid 60s. With the dryers, you have to wonder at the cost effectiveness with the parts involved. Frigidaire Flowing Heat dryers were on the slow side, too, when CU tested them and I think that the models tested were in the middle of the lineup, at least the deluxe range, so they should have had the standard heaters and blowers.
The thing I liked least about the Frigidaire dryer was how low the drum opening is. It is much lower to the floor than that of a GE dryer.