That’s a Daisy 880 and one of those was my first gun. I got a new one for my 4th birthday back in 1976, they were mostly metal back then and sure don’t make them like they used to. Nice find.
Yes, it's a Daisy 880 .177cal pumper. I have two of these Sears, Roebuck & Co El Dorado's, as they were called for the Sears only rifles. Both built 1973, the second year of Daisy's contract with Sears. Then Daisy started selling their own as the 880. Disturbingly quiet at 10 pumps! But still hits hard, & isn't terribly pellet picky. Here's a pic also of the pellets I made those holes with;