This is my interpretation of the classic Tom Threepersons holster, there are a few changes to the design. I enclosed the trigger guard to provide full coverage. The retention strap is removable with a snap on the rear if you prefer an open top holster rather than a retention setup. You can also move the strap above the hammer to allow you to pivot it forward to draw rather than unsnapping.
Classic Tom Threepersons OWB(outside the waistband) Holster