22 mag ID -solved-

[SunsetIE]

Found what i think is a High Standard (possibly Sport King) magazine, anyone else concur?

[H8Mud]

You seem to be correct on the sport king, it appears to be missing some parts.

[M76]

High Standard Duramatic, Sport King, etc.

https://www.midwayusa.com/product/1006151447?pid=336697

[bohoki]

they are hard to load without the follower button

[SonofWWIIDI]

+1 on the Sport King.

A buddy of mine got one at an estate sale sometime back and the mags look just like that.

[SunsetIE]

Thanks all for confirming it. Found it in a box of old junk, too bad the button is missing.

[3006]

I have a Sport King with the orginal Magazine its stamped Hi-Standard on the base plate
It is convexet the opposite of the one you have pictured