Al is right. All of the F-9 series were high output moving magnets. The styli differed in shape and materials used.
http://www.vinylengine.com/cartridge_database.php?m=Grace&t=any&mod=&sort=1&Search=Search&sty=&ovlo=&ovhi=&can=&dclo=&dchi=&stid=&masslo=&masshi=¬es=&prlo=&prhi=
http://www.vinylengine.com/cartridge_database.php?m=Grace&t=any&mod=&sort=1&Search=Search&sty=&ovlo=&ovhi=&can=&dclo=&dchi=&stid=&masslo=&masshi=¬es=&prlo=&prhi=