Are you sure someone hasn't altered the pre-27? Is the serial number intact and of the right depth? I have seen the condition you describe on a Colt military contract Army and Navy revolver where someone removed the butt markings, probably to cover up a stolen gun.
Remove the grips from both the .357 and the .38-44 and look at the frames themselves, measuring the bottom parts from the hole to the butt.
Jim
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