This is a Eagle No Pin 6 Lever Push Key Padlock. It was made from 1870 to 1890. This lock is at least 126 years old. This lock was made by Eagle Lock Co. In Terryville Ct. It has a "Miller Number" of (60.0) This lock is listed in Don Stewart's 1992 "Round Six Lever Push Key Padlocks Book" 26 years ago starting at $80.00. This was locked when I got it. I picked it and made the key you see. The key is the wide Worlds Fair Key
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Just based on the design and when the popularity of 5/6/7 lever locks peaked - ~1880's to 1890's. I've been fortunate enough to dig several and researched them. Never an Eagle brand, though.