I bought a 14" 22LR match barrel with this rear sight on it. Was wondering if anybody knows how old this sight is or when it came available. The large dial has 5 numbers. I saved these picture's when I bought the barrel.

I have a 7mm TCU 14" blue barrel re-chamber to a R-Int. which is a 30/30 case necked down to 7MM Has original sights and is in great condition with slight rub marks. I got this barrel on a trade, and was told it was chambered by a bench rest gunsmith in Bloomsburg, PA named Vince Pastorek. Also...