Could fit Winchester 490. I believe they are a 1 of type magazine. They came in 5 or 10 shot.
Some of the 500 series Remington's look like that also.
It's not a 490 magazine. They have a tab/notch thing protruding from the spine. This one has two small v cuts to retain the mag.
Remington 5xx series is possible. It does look identical to the magazine pictured on Brownells website, but doesn't seem to match any other references for 5xx magazines.
Brownells:
Additional research indicates it may be a Stevens magazine that fits the: Savage or Stevens Savage Arms / Stevens Models 1, 2, 4C, 4CD, 4E, 7, 7A, 7H, 19 (Serial # 45,000 and up), 19-33, 26C, 33, 34, 35, 56, 56C, 056C, 57, 057, 54, 65, 84, 084, 840S, 084S, 84C, 84CDS, 84CD, 84S, 84E, 85, 085, 85A, 85E, 85K, 85KE, 85H, 416, 420, 850, & 850H in 22 LR. Also fits the Westpoint 435.
Good lord that's a long list.