Hopefully Hondo44 will see this and chime in, but what you have is what I would qualify as a late improved I frame. It has the larger grip frame (and coil mainspring, of course) but still has the smaller window in the frame limiting it to the shorter 38 S&W round rather than the 38 Spl in the Chief's Special. Sorry, but that's about all I have off the top of my head.
Froggie
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