Originally Posted by repechage

rear dropouts appear closer to stamped than forged, but does have a derailleur tab, machined cable stops for shift cables adjacent to the bottom bracket.
LONG top eyes, "production" effort to the lugs... My conjecture straight gauge tubing... But, double check the seat lug ears are not distorted inward.

shine a bright light down the head tube looking for headbadge fastener holes. My feeling is this is older than younger.