Help identifying rifled choke? 6 inch 1 in 70

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Douglas/shilo MB
I got a rifled choke with no markings, wondering if anyone knows what it is.
It is 6” long total, Winchester/invecitor thread, and about 1;70 twist with shallow rifling.
Pretty thick tube past the choke, and I estimated the twist because it is about the same twist as may Carson choke but in twice the distance.
Possibly a very early one?

Thank you
 
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