That would be a Quail Hammerless. This will have 3 inch chambers. They are very neat and of much better workmanship than the "lower grades". The wood on mine is quite nice.
They are bringing around $1200 if in high condition and around $700/900 if less.
If I remember correctly, Russ (the Crescent guru) said that circa 1925 was their start date. But like that wonderful man would add, I could be wrong.
Best,
John

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