1970s Lee 200Z and Copper King 99Z comparison
The back pockets are reinforced with double bartacks on both jeans -- the characteristic X bartacks on the Lee, and parallel bartacks on the Copper King.
In terms of construction, these are basically identical, the only difference being the angle of the second bartack.

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1930s Snag Proof buckle back jeans
Another rare detail on this pair is the use of an exposed rivet and a bartack on the same back pocket.
To deal with the numerous complaints from customers about damage to car seats or furniture caused by the exposed rivets on the back pockets, Levi's famously introduced their patented concealed rivets in the mid-1930s. Other brands solved the problem in different ways; Lee used their characteristic X bartacks and Wrangler used smooth dome-shaped rivets that were less likely to scratch the furniture.
All brands, however, used the same solution on all four corners of the back pocket. This is what makes this Snag Proof model so unique.
Damage to furniture is almost exclusively due to the rivets on the inner corners of the back pockets. Snag Proof made the perfect compromise, retaining the exposed rivets on the outer corners for maximum strength, and adopting bartacks on the inner corners for non-scratch reinforcement.
This feature is one reason I believe this pair to be from the late 1930s, as it was likely introduced in response to Levi's concealed rivets.

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S-111. Bartacking using the Singer Blue Champion.

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