It's NSN 1240-01-435-1916 if thats of any help. It's a small amber dot that is still very bright. The guy I bought it from said its 6 years old. The glass is very clear, no scratches, the only wear is on the blued parts which could be easily touched up with some cold blue. Its a great sight just don't have enough rifles to put it on. I accept pay pal, if you want it.