I got this back sight on a 1911 some time ago. I have not been able to find out anything about it. It is a precision made item. Machined out of alumilum. It has knurled bushings holding the lenses. No magnification, seems to be optical peep sight. It has standard dove tail to fit Colt 1911 without modification. It has two Allen screws to allow drift and lock. Its about .75 high from bottom dove tail, approx .50 above top of slide. That would put center of lens at .25 from top slide. Front has inlaid flo orange stripe. Anyone know what this is and who made it? Attachment 282584Attachment 282585