The denim, rivets, and stitching.
A cuff, a pocket corner, or a few stitches beside the fly can tell us more than the amount of fading. Leave everything as you found it while you look.
Redline selvedge
Turn up a cuff and look at the long seam on the outside of the leg. Selvedge is the finished edge made as the fabric is woven. On many older 501s, it appears as a narrow pale strip with a red thread running through it. That is the detail people mean by “redline” or “red ear.”
A cut edge wrapped in overlocking stitches is different. Earlier selvedge can have a plain edge, and a faint red thread may be difficult to see. You do not have to find a bright red stripe for us to take a look.
Levi’s history places the introduction of Cone’s red identifier thread around 1927. The move to wider denim happened in the early to middle 1980s, with overlapping production. Selvedge is also used on modern jeans, so it helps us read a pair but does not prove its age.
We buy vintage redline 501s. A photo of the whole pair and a turned cuff is a useful place to start.
Hidden back pocket rivets
These sit at the upper corners of the back pockets, covered by denim on the outside. Look inside the jeans behind the pockets for the metal backs. They are different from the exposed rivets beside the front pockets.
Levi’s began covering the back pocket rivets in 1937 to keep them from scratching surfaces. The company records their replacement with reinforcing bar tacks in 1966. A bar tack is a short, dense group of stitches.
Hidden rivets are an important detail on older 501XX pairs. Please do not pull a pocket away, cut a seam, or remove a repair to expose one. If the area is difficult to see, leave it alone and show us what is visible.
V stitching beside the top button
The V stitch is a small angled line near the top fly button, where the stitching turns back toward the waistband. It is separate from the curved stitching across the back pockets.
On original vintage 501s, this detail is associated with production before about 1969. Later Big E pairs can lack it. The waistband stitching, rivets, patch, and tab help narrow the period; a V stitch alone does not authenticate a pair.
If you can see it easily, include the top button area in a photo. There is no need to take the jeans apart or trace every stitch before contacting us.
Single stitch back pockets
When collectors describe a 501 as “single stitch,” they often mean the stitching along the upper hem of the back pocket, viewed from the reverse. A lockstitch looks different from the linked loops of a chain stitch.
This is not the same as the leg hem, the curved pocket design, or the seam running down the inside of the leg. Those are separate details. A pair can have more than one kind of stitching.
Older small e selvedge pairs are sometimes described as “66 single” and “66 chain.” The single stitch version belongs broadly to the early and middle 1970s, with the change to chain stitching around 1977 or 1978. “66” is a collector term, not the year every pair was made. Compare the pocket with the tab, care label, and denim before narrowing the date.
Single stitch 501s are within our buying interests. If you are unsure which seam you are looking at, ordinary photos are still enough to begin.