Hi all I have some reissue fender wide range humbuckers that have been pulled apart and put back together many, many times. I can't remember if i switched the baseplate or magnets around on either the neck or bridge. I can identify the coils easily but is there a way to visually identify if the bar magnet is alnico 2 or 4/5 etc? Or is there some other test that I could perform? Thanks.