What is the approximate age and value a nickel steel Winchester mod1912 - 12 ga serial 66417?

The Winchester Model 1912, commonly known as the "Model 12," was produced from 1912 until 1964, with your serial number indicating it was likely manufactured in the early 1910s. The value of a nickel steel Model 12 in good condition typically ranges from $500 to $1,500, depending on factors like condition, rarity, and any specific features. For an accurate appraisal, it's best to consult a firearms expert or appraiser.