The Model B unquestionably ranks as probably the single most successful subminiature camera Minox ever produced: 384,327 made over it's 14 year manufacturing cycle beginning with its introduction in 1958. It's not hard to see why: forjust an ounce or two of added weight, and about an inch in added length, the Minox photographer for the first time had built in, coupled semi-automatic exposure control. The Gossen supplied internal selenium cell exposure metre allowed one to quickly measure the illumination of the scene, turn the shutter speed dial until the index lined up with the metre needle mark, and shoot the picture, confident that it would be properly exposed. The Model B retained the normal green and neutral density sliding filtre combination, but returned to the earlier, manual retraction: the filtre remained in place from shot to shot until the photographer slid it back out of the way if not needed. The B was the last of the models whose film counters were calibrated for 50 shot rolls: 50 shot rolls would largely be discontinued by the mid-1960's so subsequent models would be calibrated for the 36 and 15 shot rolls that replaced them. Collectors note two distinct, cosmetic variations of the Model B: "1st Version" models, whose selenium element window glass has a square lattice work, while later, "2nd Version" models had a honeycomb lattice work. Model B's in fine working condition are quite common, in prices ranging from $150 - $300, and make excellent shooters. Higher prices are more reflective of mint cosmetic appearance, therefore higher collector's appeal. While the selenium cells on some Model B's may have degraded over time, they can be replaced fairly easily by a qualified service technician.