Welcome to the forum. With that serial number, your K-22 Outdoorsman was probably shipped from the factory in 1937, possibly 1938.

The hammer has been reconfigured by someone who knew what he was doing. The spur was cut from the standard factory hammer, and a differently shaped wider spur was added. That would be an excellent hammer to use for single-action target competition.

If the double action feature does not work, it indicates to me that the double action sear was removed from the hammer at the time the hammer was modified. It is possible that you could restore the double action function by simply installing a new double action sear (you would need a pin, spring and sear for the complete installation, and you might have to have a gunsmith fit the sear precisely). If the hammer has been further modified on the part we cannot see, you might need to install a completely new hammer assembly to get both single-action and double-action functionality. You would need a 1930s era hammer; after the war the K-22 hammers have a different profile.

The wooden stocks on your gun are from many years after the gun was manufactured. The stocks we see now cannot have been made earlier than1968 based on the absence of a relieved diamond around the screw escutcheon.

Very interesting gun. Do you shoot it? How is its accuracy?

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David Wilson