This is the 4th model of Levi's 70505 denim jacket with lining, manufactured in 1980, which is the same period as "66-chain" in 501.
Dead stock with glue still attached. The flasher is still intact. Unlike its successors, 71505 and 71506, it does not have hand warmers.
flasher
Flasher on the left pocket. The flasher on the left pocket shows the shrinkage rate and other information.
inner tag
Tag under the patch. It says "050 052", so it must have been made at Factory 52 in May 1980.
adjuster
Adjusters at waist. The thickness of the belt. The thickness of the belt is uniform up to the tip.
inner tag
There is also an internal tag indicating that the lining is made by Troy. The material is rayon 40%, polyester 60%.