【N Mint++ in BOX 1/2 Shutter Setting】 Pentax 67II AE Grip P 105mm from Japan
When the shutter dial is set between 4s and 1000s, moving the film sensitivity lever to the front will change the shutter speed to 1/2 step faster than the set shutter speed and moving it to the back will change it to 1/2 step slower.