Decade
Hidden-rivet Levi's 501XX, the short Type II jacket, Lee's zip-fly 101-Z and Wrangler's first Cowboy Cut, renamed the 13MWZ in 1952. Levi's and Lee pairs from the decade are selvedge and none carry a care label, which makes the tags, buttons and pocket stitching the things to read.
8 models we cover.

Levi's · Straight leg
501XXHidden back-pocket rivets about 1937–1966
$2,300–$5,150 typical ask
24 on eBay
Levi's · Jackets and coats
507XX1953 to about 1962
$3,150–$7,500 typical ask
15 on eBay
Lee · Straight leg
191-ZAbout 1950 into the 1970s
$25–$45 typical ask
51 on eBay
Lee · Straight leg
101-ZLate 1920s to the early 1970s; reissued today
$280–$1,550 typical ask
25 on eBay
Big Yank · Jackets and coats
Coverall1950s
$60–$150 typical ask
12 on eBay
Big Yank · Straight leg
Dungarees1950s
$35–$70 typical ask
51 on eBay
Wrangler · Straight leg
11MWZ1947 to about 1952, then renamed 13MWZ
$1,150–$2,550 typical ask
25 on eBay
JCPenney · Slim
ForemostLate 1940s to the mid-1960s
$80–$250 typical ask
48 on eBay