hi all ,sorry i know this is an old chestnut,a friend showed me a parker hale 16[yes just 16 no letter after it] aperture rear sight last night.i know from doing a search on here that the one fitted to the webley mk3 supertarget is the ph16m.my friends sight looks very simular to a ph16m[found a photo when i did the search] but there must be a difference .anyone know what it is?any info would be much appreciated..thanks..greasemonkey