It's Peerless. Same sprocket used on Peerless differentials. Atlas probably used them on their mowers. This is the one on my scratch built trike. The diff is from a mower. The bolts go all the way through the diff and sprocket.
I have five new 40 tooth # 41 sprockets with that bolt pattern. They came in a lot of Ken Bar minibike and go kart parts I bought from a lawn mower shop. So, like jimh said, it's probably a mower sprocket that has been adapted to your minibike hub.
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