You have most of the information you need - -
I bought one of these conversions from Montgomery Ward's in Fort Worth around 1963 or so. This one was marked as you describe. The barrel had been cut to about 3.5 inches and a decent-looking ramp front sight installed. Factory smooth wood stocks had been replaced with checked wood. Mine shot fairly well with standard velocity 158 gr lead round nose ammo, and better still with factory wadcutter target loads. I imagine this had to do with the hollow base bullets slugging out to fit the bore well.
I reloaded for mine, but typically only got one reload, sometimes two, before the over-expanded brass split. I'm told these shot well with the .38 S&W ammunition, though I never tried this.
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Blog: Expert Witness