This is a Trucker Type I jacket, introduced in the early 1900's the clincher on the back appears to be a silver color, so before the mid 40's. During the 1940's Levis used bronze to cut costs. The Levis label would have 506XX lot number, but your jacket seems to be without the Levis label. We can't give value to items, but it's a very nice jacket. Anyone else have info?