Yeah the model will definitely make a difference in value. The broken butt plate will reduce the value a little bit, depending if it is just cosmetic or a functional problem such as snagging when you mount it. The BRNO .22LRs started as USSR WW2 training rifles. In excellent shape they can be quite valuable as they are known to be very accurate. Note some of them were refinished and stored, so they may not be original. Here's a break down of what I know of BRNO .22s. Model 1 & 2 are the sporter (regular) barrel versions. Model 3 & 4 are heavy target barrels. Model 5 is a sporter target barrel. Model 1 & 2 are common, but still sought after. Not many owners sell them. Model 1 has a flip up rear sights for 50, 75, and 100m. Model 2 has adjustable rear sight. Model 3 & 4 are more rare with heavy barrels. I haven't seen them myself. Model 5 is reported to be the most desirable. They seem to be rare too and I've not seen them either. It's safety is suppose to be tangent like the CZ452's, as compared to the model 1 & 2 that have an inline switch.