Introduced in the late 1950s, the Konica IIIA was an update on the previous Konica III model. It features a combined viewfinder and rangefinder, a left-hand rapid advance lever situated at the base of the lens, hinged back door and a nifty, fold-down rewind crank. The Konica IIIA is an incredibly well built rangefinder that features an integrated 50mm lens. Konica produced the camera with one of two lenses: a 50mm f1.8 Hexanon or a 48mm f2 Hexanon. Either way the IIIA has a pleasantly fast lens on it, though our preference is the 50mm f1.8 version. The camera has a Seikosha-MXL leaf shutter that has a top speed of 1/500, which is both quiet and allows flash sync all the way to its fastest speed. Interestingly enough, the IIIA's shutter and aperture selection are naturally coupled to allow for EV selection when setting exposure settings - similar to how many German cameras of the time operated.
Overall, the Konica IIIA is a sneaky good rangefinder. It often sells for less than more popular integrated lens rangefinders cameras such as the Canonet QL17. You do not see the Konica IIIA model nearly as often though, so perhaps this is why it flies under so many radars.