I removed this from a Nikkormat FT , it has a 19mm screw in thread and as you can see from the main picture is 0 Zero Dioptre , be aware this does fit other models BUT .... this has a wider profile fo on some models like the FA and FM2 etc , you can`t opon the rear door with this in place so please do your research so you don`t buy the wrong item . Normal signs of use mainly round the very edge this is in good usable condition . You get exactly what you see in the listing  Free UK P&P .