For the S.N. listed I believe 1976 is the correct date; 1975-1976 S.N. range was A265001-A295000. There were some features that add value to these; 5 inch barrel with extended sight, 5.5 inch heavy barrel with extended sight and 7.5 inch with muzzle brake. Sorry but my pricing quides are somewhat out of date though the newest price quide I have (I've got to get the new Standard Catalog and Blue Book) has NIB 850, Exc 600 V.G. 400, Good 300, Fair 225, Poor 150. The added value options above are quoted at 75-100.
There is also a Model 411 that was chambered for .22 short only. This commands a slight premium over the Model 41 as less than 1000 were manufactured.
