The Winchester 103C front sight began to appear on Sporter and Featherweight rifles in 1941, replacing the Lyman 31W. The 103C was used as the front sight on all model 70s until 1963, the only exceptions being the Super Grade and Marksman rifles.
Pricing based on condition.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE