I bought a high condition Model 63 at an auction for $176.00. It was drilled on the side for the N mount. Without the holes, it would be a $950 gun and I wouldn't own it. I'm very happy with it and the 3/4" Redfield in the N mount. Don't throw good money after bad. Enjoy your 61 the way it is. There is almost nothing you can do to it to increase its value. By the way, the N mount is ugly, but it is cheap and can be installed with thumb screws or similar. The Redfield is about the only high quality scope to fit the 3/4" N mount, but they are not impossible to find. They look great on a Model 61.