Have no idea...maybe HRA or late SA? They range from .700 to .790 wide--outside of ears. ---- These sights are in very nice condition. No rust pits-no stake marks on front-no bent ears. Parkerizing varies in color from medium grey to charcoal.----- The front sights we have listed are by approximate width outside from ear to ear.---see each individual listing as to the range of width. These are SOLD EACH so enter quantity needed in cart. We can only accept orders from and ship to an address in the United States. CLICK ON PIC FOR A BETTER LOOK