Charlie, your trigger sounds like Alfred Harvey Worrest's Infallible Single Trigger as produced by his Lancaster Arms Co. Briefly in the teens Ithaca Gun Co. offered the Infallible Single Trigger on their Flues doubles.
Parker Bros. may have also used it a bit, as I have seen a 1913-vintage Parker Bros. Walter King letter to a customer where he says "As to your request we have removed our infallible single trigger, and installed the double trigger system."
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