Hi Phil,
The 1 1/2 Frame eventually replaced the 1 Frame as the lighter of the 12 gauge Parkers while the 2 Frame was kept as the heavier (though a few 3 Frames are known). Eventually the 1 1/2 Frame became the 'common' frame size even in competition 12 gauge trap and skeet guns. In the very late 1920's the 1/2 frame was developed and produced in the 1930's but it is believed less than 500 were produced on the 1/2 Frame.
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