All RF coupled except the 200, but that can be scale focused. Well, limited compared to SLRs. Actually, the 28 to 135 coupled rangefinder range is as wide as you are likely to find in a leaf shutter 35 rangefinder. The Viewfinder has a strong tendency to fog and haze up over the years, a cleaning by a Retina specialist will likely be required. Retina IIIS's have a reputation for being hard to work on.
Many repairmen refuse to attempt it, or indeed any of the later Retinas.
It takes a Retina specialist to get it right. Very strange indeed. Retina IIIS's, like all the later Retinas, have a strong tendency to gum up and stop working after years of storage. Expect an overhaul if it hasn't had one recently. The lens focusing lever is small and very inconvenient.