I agree with the two preceding posts. That is very likely to be a mid-'30s Heavy Duty that was converted to a target configuration by King a few years later. King could have dropped a S&W humpback hammer into the gun with no trouble at all at the time they put their sights on it.
So you appear to have a "virtual" McGivern Outdoorsman rather than a King-modified original, but the fact remains that the configuration is well regarded by the shooting/collecting community. Five-inch N-frames with adjustable sights and in any caliber are much sought after.
The B in the ejector rod shroud is an indicator that this gun was to be finished in blue. You would see N if it was slated for finishing in Nickel.
So you appear to have a "virtual" McGivern Outdoorsman rather than a King-modified original, but the fact remains that the configuration is well regarded by the shooting/collecting community. Five-inch N-frames with adjustable sights and in any caliber are much sought after.
The B in the ejector rod shroud is an indicator that this gun was to be finished in blue. You would see N if it was slated for finishing in Nickel.